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  • 1. A. Madsen, Kevin
    et al.
    J. Bergholtz, Emil
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Brouwer, Piet W.
    Josephson effect in a Weyl SNS junction2017Inngår i: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 95, nr 6, 064511Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We calculate the Josephson current density j (phi) for a Weyl superconductor-normal-metal-superconductor junction for which the outer terminals are superconducting Weylmetals and the normal layer is a Weyl (semi) metal. We describe the Weyl (semi) metal using a simple model with two Weyl points. The model has broken time-reversal symmetry, but inversion symmetry is present. We calculate the Josephson current for both zero and finite temperature for the two pairing mechanisms inside the superconductors that have been proposed in the literature, zero-momentum BCS-like pairing and finite-momentum FFLO-like pairing, and assuming the short-junction limit. For both pairing types we find that the current is proportional to the normal-state junction conductivity, with a proportionality coefficient that shows quantitative differences between the two pairing mechanisms. The current for the BCS-like pairing is found to be independent of the chemical potential, whereas the current for the FFLO-like pairing is not.

  • 2.
    A. Zheltukhin, A
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Unification of twistors and Ramond vectors2007Inngår i: Physics letters B, Vol. 658, 82- s.Artikkel i tidsskrift (Fagfellevurdert)
  • 3. Aad, G.
    et al.
    Abbott, B.
    Abdallah, J.
    Gellerstedt, Karl
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Measurement of the top quark pair production cross section with ATLAS in pp collisions at √s = 7 TeV in dilepton final states2011Rapport (Annet vitenskapelig)
    Abstract [en]

    A measurement is presented of the production cross section of top quark pairs (σ_{\ttbar{}}) in proton-proton (pp) collisions at √s = 7 TeV recorded with the ATLAS detector at the CERN Large Hadron Collider. Using a data sample of 35 pb−1, candidate events are selected in the dilepton topology with large missing transverse energy, \met{}, and at least two jets.

    A baseline analysis employing kinematic properties of the candidate events to separate the signal from background and using data-driven techniques to determine the most important backgrounds, results in a measurement ofσ_{\ttbar{}} = 173 ± 22(stat.)+18 −16(syst.)+8 −7(lum.) pb,

    where the three uncertainties are from statistics, systematics and integrated luminosity, respectively.

    We also perform a cross section measurement requiring at least one b-tagged jet and a looser kinematic selection that increases the signal-to-background ratio, yielding

    σ_{\ttbar{}} = 171 ± 22(stat.)+21 -16(syst.)+7 −6(lum.) pb.

    Additional studies are performed to corroborate these measurements; a technique that normalizes the \ttbar{} signal yield to the measured rate of Z decays, a two-dimensional template shape fit using the \met{} vs the number of jets to simultaneously measure the production cross sections of \ttbar{}, WW and Z → ττ final states, and a simultaneous measurement of σ_{\ttbar{}} and the b-tagging efficiency using the distribution of the number of tagged jets in each event.

    All the measurements are in good agreement with each other and the Standard Model prediction.

  • 4. Aad, G.
    et al.
    Åsman, Barbro
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC).
    Bohm, Christian
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Clément, Christophe
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC).
    Eriksson, Daniel
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Gellerstedt, Karl
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC).
    Hellman, Sten
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC).
    Hidvégi, Attila
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Holmgren, Sven-Olof
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Johansen, Marianne
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC).
    Johansson, K. Erik
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Jon-And, Kerstin
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC).
    Lesser, Jonas
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Milstead, David A.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC).
    Moa, Torbjörn
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC).
    Nordkvist, Björn
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC).
    Ohm, Christian C.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC).
    Ramstedt, Magnus
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC).
    Selldén, Björn
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Silverstein, Samuel B.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Sjölin, Jörgen
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC).
    Tylmad, Maja
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC).
    Yang, Zhaoyu
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC).
    Zutshi, V.
    Search for New Particles in Two-Jet Final States in 7 TeV Proton-Proton Collisions with the ATLAS Detector at the LHC2010Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 105, nr 16, 161801- s.Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A search for new heavy particles manifested as resonances in two-jet final states is presented. The data were produced in 7 TeV proton-proton collisions by the LHC and correspond to an integrated luminosity of 315 nb(-1) collected by the ATLAS detector. No resonances were observed. Upper limits were set on the product of cross section and signal acceptance for excited-quark (q*) production as a function of q* mass. These exclude at the 95% C. L. the q* mass interval 0: 30< m(q)*< 1:26 TeV, extending the reach of previous experiments.

  • 5. Aalbers, J.
    et al.
    Agostini, F.
    Alfonsi, M.
    Amaro, F. D.
    Amsler, C.
    Aprile, E.
    Arazi, L.
    Arneodo, F.
    Barrow, P.
    Baudis, L.
    Benabderrahmane, M. L.
    Berger, T.
    Beskers, B.
    Breskin, A.
    Breur, P. A.
    Brown, A.
    Brown, E.
    Bruenner, S.
    Bruno, G.
    Budnik, R.
    Butikofer, L.
    Calvén, Jakob
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Cardoso, J. M. R.
    Cichon, D.
    Coderre, D.
    Colijn, A. P.
    Conrad, Jan
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Cussonneau, J. P.
    Decowski, M. P.
    Diglio, S.
    Drexlin, G.
    Duchovni, E.
    Erdal, E.
    Eurin, G.
    Ferella, Alfredo
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Fieguth, A.
    Fulgione, W.
    Rosso, A. Gallo
    Di Gangi, P.
    Di Giovanni, A.
    Galloway, M.
    Garbini, M.
    Geis, C.
    Glueck, F.
    Grandi, L.
    Greene, Z.
    Grignon, C.
    Hasterok, C.
    Hannen, V.
    Hogenbirk, E.
    Howlett, J.
    Hilk, D.
    Hils, C.
    James, A.
    Kaminsky, B.
    Kazama, S.
    Kilminster, B.
    Kish, A.
    Krauss, L. M.
    Landsman, H.
    Lang, R. F.
    Lin, Q.
    Linde, F. L.
    Lindemann, S.
    Lindner, M.
    Lopes, J. A. M.
    Undagoitia, T. Marrodan
    Masbou, J.
    Massoli, F. V.
    Mayani, D.
    Messina, M.
    Micheneau, K.
    Molinario, A.
    Morå, Knut D.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Morteau, E.
    Murra, M.
    Naganoma, J.
    Newstead, J. L.
    Ni, K.
    Oberlack, U.
    Pakarha, P.
    Pelssers, Bart
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    de Perio, P.
    Persiani, R.
    Piastra, F.
    Piro, M. C.
    Plante, G.
    Rauch, L.
    Reichard, S.
    Rizzo, A.
    Rupp, N.
    Dos Santos, J. M. F.
    Sartorelli, G.
    Scheibelhut, M.
    Schindler, S.
    Schumann, M.
    Schreiner, J.
    Lavina, L. Scotto
    Selvi, M.
    Shagin, P.
    Silva, M. C.
    Simgen, H.
    Sissol, P.
    von Sivers, M.
    Thers, D.
    Thum, J.
    Tiseni, A.
    Trotta, R.
    Tunnell, C. D.
    Valerius, K.
    Vargas, M. A.
    Wang, H.
    Wei, Y.
    Weinheimer, C.
    Wester, T.
    Wulf, J.
    Zhang, Y.
    Zhu, T.
    Zuber, K.
    DARWIN: towards the ultimate dark matter detector2016Inngår i: Journal of Cosmology and Astroparticle Physics, ISSN 1475-7516, E-ISSN 1475-7516, nr 11, 017Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    DARk matter WImp search with liquid xenoN (DARWIN(2)) will be an experiment for the direct detection of dark matter using a multi-ton liquid xenon time projection chamber at its core. Its primary goal will be to explore the experimentally accessible parameter space for Weakly Interacting Massive Particles (WIMPs) in a wide mass-range, until neutrino interactions with the target become an irreducible background. The prompt scintillation light and the charge signals induced by particle interactions in the xenon will be observed by VUV sensitive, ultra-low background photosensors. Besides its excellent sensitivity to WIMPs above a mass of 5 GeV/c(2), such a detector with its large mass, low-energy threshold and ultra-low background level will also be sensitive to other rare interactions. It will search for solar axions,galactic axion-like particles and the neutrinoless double-beta decay of Xe-136, as well as measure the low-energy solar neutrino flux with <1% precision, observe coherent neutrino-nucleus interactions, and detect galactic supernovae. We present the concept of the DARWIN detector and discuss its physics reach, the main sources of backgrounds and the ongoing detector design and R&D efforts.

  • 6. Aartsen, M. G.
    et al.
    Ackermann, M.
    Adams, J.
    Aguilar, J. A.
    Ahlers, M.
    Ahrens, Maryon
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC).
    Altmann, D.
    Anderson, T.
    Arguelles, C.
    Arlen, T. C.
    Auffenberg, J.
    Bai, X.
    Barwick, S. W.
    Baum, V.
    Bay, R.
    Beatty, J. J.
    Tjus, J. Becker
    Becker, K. -H
    BenZvi, S.
    Berghaus, P.
    Berley, D.
    Bernardini, E.
    Bernhard, A.
    Besson, D. Z.
    Binder, G.
    Bindig, D.
    Bissok, M.
    Blaufuss, E.
    Blumenthal, J.
    Boersma, D. J.
    Bohm, Christian
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Bos, F.
    Bose, D.
    Boeser, S.
    Botner, O.
    Brayeur, L.
    Bretz, H. -P
    Brown, A. M.
    Brunner, J.
    Buzinsky, N.
    Casey, J.
    Casier, M.
    Cheung, E.
    Chirkin, D.
    Christov, A.
    Christy, B.
    Clark, K.
    Classen, L.
    Clevermann, F.
    Coenders, S.
    Cowen, D. F.
    Silva, A. H. Cruz
    Daughhetee, J.
    Davis, J. C.
    Day, M.
    de Andre, J. P. A. M.
    De Clercq, C.
    De Ridder, S.
    Desiati, P.
    de Vries, K. D.
    de With, M.
    De Young, T.
    Diaz-Velez, J. C.
    Dunkman, M.
    Eagan, R.
    Eberhardt, B.
    Eichmann, B.
    Eisch, J.
    Euler, S.
    Evenson, P. A.
    Fadiran, O.
    Fazely, A. R.
    Fedynitch, A.
    Feintzeig, J.
    Felde, J.
    Feusels, T.
    Filimonov, K.
    Finley, Chad
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC).
    Fischer-Wasels, T.
    Flis, Samuel
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC).
    Franckowiak, A.
    Frantzen, K.
    Fuchs, T.
    Gaisser, T. K.
    Gaior, R.
    Gallagher, J.
    Gerhardt, L.
    Gier, D.
    Gladstone, L.
    Gluesenkamp, T.
    Goldschmidt, A.
    Golup, G.
    Gonzalez, J. G.
    Goodman, J. A.
    Gora, D.
    Grant, D.
    Gretskov, P.
    Groh, J. C.
    Gross, A.
    Ha, C.
    Haack, C.
    Ismail, A. Haj
    Hallen, P.
    Hallgren, A.
    Halzen, F.
    Hanson, K.
    Hebecker, D.
    Heereman, D.
    Heinen, D.
    Helbing, K.
    Hellauer, R.
    Hellwig, D.
    Hickford, S.
    Hill, G. C.
    Hoffman, K. D.
    Hoffmann, R.
    Homeier, A.
    Hoshina, K.
    Huang, F.
    Huelsnitz, W.
    Hulth, Per Olof
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC).
    Hultqvist, Klas
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC).
    Hussain, S.
    Ishihara, A.
    Jacobi, E.
    Jacobsen, J.
    Jagielski, K.
    Japaridze, G. S.
    Jero, K.
    Jlelati, O.
    Jurkovic, M.
    Kaminsky, B.
    Kappes, A.
    Karg, T.
    Karle, A.
    Kauer, M.
    Keivani, A.
    Kelley, J. L.
    Kheirandish, A.
    Kiryluk, J.
    Klaes, J.
    Klein, S. R.
    Koehne, J. -H
    Kohnen, G.
    Kolanoski, H.
    Koob, A.
    Koepke, L.
    Kopper, C.
    Kopper, S.
    Koskinen, D. J.
    Kowalski, M.
    Kriesten, A.
    Krings, K.
    Kroll, G.
    Kroll, M.
    Kunnen, J.
    Kurahashi, N.
    Kuwabara, T.
    Labare, M.
    Lanfranchi, J. L.
    Larsen, D. T.
    Larson, M. J.
    Lesiak-Bzdak, M.
    Leuermann, M.
    Luenemann, J.
    Madsen, J.
    Maggi, G.
    Maruyama, R.
    Mase, K.
    Matis, H. S.
    Maunu, R.
    McNally, F.
    Meagher, K.
    Medici, M.
    Meli, A.
    Meures, T.
    Miarecki, S.
    Middell, E.
    Middlemas, E.
    Milke, N.
    Miller, J.
    Mohrmann, L.
    Montaruli, T.
    Morse, R.
    Nahnhauer, R.
    Naumann, U.
    Niederhausen, H.
    Nowicki, S. C.
    Nygren, D. R.
    Obertacke, A.
    Odrowski, S.
    Olivas, A.
    Omairat, A.
    O'Murchadha, A.
    Palczewski, T.
    Paul, L.
    Penek, Oe.
    Pepper, J. A.
    de los Heros, C. Perez
    Pfendner, C.
    Pieloth, D.
    Pinat, E.
    Posselt, J.
    Price, P. B.
    Przybylski, G. T.
    Puetz, J.
    Quinnan, M.
    Raedel, L.
    Rameez, M.
    Rawlins, K.
    Redl, P.
    Rees, I.
    Reimann, R.
    Relich, M.
    Resconi, E.
    Rhode, W.
    Richman, M.
    Riedel, B.
    Robertson, S.
    Rodrigues, J. P.
    Rongen, M.
    Rott, C.
    Ruhe, T.
    Ruzybayev, B.
    Ryckbosch, D.
    Saba, S. M.
    Sander, H. -G
    Sandroos, J.
    Santander, M.
    Sarkar, S.
    Schatto, K.
    Scheriau, F.
    Schmidt, T.
    Schmitz, M.
    Schoenen, S.
    Schoeneberg, S.
    Schoenwald, A.
    Schukraft, A.
    Schulte, L.
    Schulz, O.
    Seckel, D.
    Sestayo, Y.
    Seunarine, S.
    Shanidze, R.
    Smith, M. W. E.
    Soldin, D.
    Spiczak, G. M.
    Spiering, C.
    Stamatikos, M.
    Stanev, T.
    Stanisha, N. A.
    Stasik, A.
    Stezelberger, T.
    Stokstad, R. G.
    Stoessl, A.
    Strahler, E. A.
    Strom, R.
    Strotjohann, N. L.
    Sullivan, G. W.
    Taavola, H.
    Taboada, I.
    Tamburro, A.
    Tepe, A.
    Ter-Antonyan, S.
    Terliuk, A.
    Tesic, G.
    Tilav, S.
    Toale, P. A.
    Tobin, M. N.
    Tosi, D.
    Tselengidou, M.
    Unger, E.
    Usner, M.
    Vallecorsa, S.
    van Eijndhoven, N.
    Vandenbroucke, J.
    van Santen, J.
    Vehring, M.
    Voge, M.
    Vraeghe, M.
    Walck, Christian
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC).
    Wallraff, M.
    Weaver, Ch.
    Wellons, M.
    Wendt, C.
    Westerhoff, S.
    Whelan, B. J.
    Whitehorn, N.
    Wichary, C.
    Wiebe, K.
    Wiebusch, C. H.
    Williams, D. R.
    Wissing, H.
    Wolf, Martin
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC).
    Wood, T. R.
    Woschnagg, K.
    Xu, D. L.
    Xu, X. W.
    Yanez, J. P.
    Yodh, G.
    Yoshida, S.
    Zarzhitsky, P.
    Ziemann, J.
    Zierke, S.
    Zoll, Marcel
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC).
    Determining neutrino oscillation parameters from atmospheric muon neutrino disappearance with three years of IceCube DeepCore data2015Inngår i: Physical Review D, ISSN 1550-7998, E-ISSN 1550-2368, Vol. 91, nr 7, 072004Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We present a measurement of neutrino oscillations via atmospheric muon neutrino disappearance with three years of data of the completed IceCube neutrino detector. DeepCore, a region of denser IceCube instrumentation, enables the detection and reconstruction of atmospheric muon neutrinos between 10 and 100 GeV, where a strong disappearance signal is expected. The IceCube detector volume surrounding DeepCore is used as a veto region to suppress the atmospheric muon background. Neutrino events are selected where the detected Cherenkov photons of the secondary particles minimally scatter, and the neutrino energy and arrival direction are reconstructed. Both variables are used to obtain the neutrino oscillation parameters from the data, with the best fit given by Delta m(32)(2) = 2.72(-0.20)(+0.19) x 10(-3) eV(2) and sin(2)theta(23) = 0.53(-0.12)(+0.09) (normal mass ordering assumed). The results are compatible, and comparable in precision, to those of dedicated oscillation experiments.

  • 7. Aartsen, M. G.
    et al.
    Ackermann, M.
    Adams, J.
    Aguilar, J. A.
    Ahlers, M.
    Ahrens, Maryon
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC).
    Altmann, D.
    Anderson, T.
    Arguelles, C.
    Arlen, T. C.
    Auffenberg, J.
    Bai, X.
    Barwick, S. W.
    Baum, V.
    Beatty, J. J.
    Tjus, J. Becker
    Becker, K. -H
    BenZvi, S.
    Berghaus, P.
    Berley, D.
    Bernardini, E.
    Bernhard, A.
    Besson, D. Z.
    Binder, G.
    Bindig, D.
    Bissok, M.
    Blaufuss, E.
    Blumenthal, J.
    Boersma, D. J.
    Bohm, Christian
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Bos, F.
    Bose, D.
    Boeser, S.
    Botner, O.
    Brayeur, L.
    Bretz, H. -P
    Brown, A. M.
    Casey, J.
    Casier, M.
    Cheung, E.
    Chirkin, D.
    Christov, A.
    Christy, B.
    Clark, K.
    Classen, L.
    Cleverinann, F.
    Coenders, S.
    Cowen, D. F.
    Silva, A. H. Cruz
    Danninger, Matthias
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC).
    Daughhetee, J.
    Davis, J. C.
    Day, M.
    de Andre, J. P. A. M.
    De Clercq, C.
    De Ridder, S.
    Desiati, P.
    de Vries, K. D.
    de With, M.
    DeYoung, T.
    Diaz-Velez, J. C.
    Dunkman, M.
    Eagan, R.
    Eberhardt, B.
    Eichmann, B.
    Eisch, J.
    Euler, S.
    Evenson, P. A.
    Fadiran, O.
    Fazely, A. R.
    Fedynitch, A.
    Feintzeig, J.
    Felde, J.
    Feusels, T.
    Filimonov, K.
    Finley, Chad
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC).
    Fischer-Wasels, T.
    Flis, Samuel
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC).
    Franckowiak, A.
    Frantzen, K.
    Fuchs, T.
    Gaisser, T. K.
    Gaior, R.
    Gallagher, J.
    Gerhardt, L.
    Gier, D.
    Gladstone, L.
    Gluesenkamp, T.
    Goldschmidt, A.
    Golup, G.
    Gonzalez, J. G.
    Goodman, J. A.
    Gora, D.
    Grant, D.
    Gretskov, P.
    Groh, J. C.
    Gross, A.
    Ha, C.
    Haack, C.
    Ismail, A. Haj
    Hallen, P.
    Hallgren, A.
    Halzen, F.
    Hanson, K.
    Hebecker, D.
    Heereman, D.
    Heinen, D.
    Helbing, K.
    Hellauer, R.
    Hellwig, D.
    Hickford, S.
    Hill, G. C.
    Hoffman, K. D.
    Hoffmann, R.
    Homeier, A.
    Hoshina, K.
    Huang, F.
    Huelsnitz, W.
    Hulth, Per Olof
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC).
    Hultqvist, Klas
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC).
    Hussain, S.
    Ishihara, A.
    Jacobi, E.
    Jacobsen, J.
    Jagielski, K.
    Japaridze, G. S.
    Jero, K.
    Jlelati, O.
    Jurkovic, M.
    Kaminsky, B.
    Kappes, A.
    Karg, T.
    Karle, A.
    Kauer, M.
    Kelley, J. L.
    Kheirandish, A.
    Kiryluk, J.
    Klaes, J.
    Klein, S. R.
    Koehne, J. -H
    Kohnen, G.
    Kolanoski, H.
    Koob, A.
    Koepke, L.
    Kopper, C.
    Kopper, S.
    Koskinen, D. J.
    Kowalski, M.
    Kriesten, A.
    Krings, K.
    Kroll, G.
    Kroll, M.
    Kunnen, J.
    Kurahashi, N.
    Kuwabara, T.
    Labare, M.
    Larsen, D. T.
    Larson, M. J.
    Lesiak-Bzdak, M.
    Leuermann, M.
    Leute, J.
    Luenemann, J.
    Madsen, J.
    Maggi, G.
    Maruyama, R.
    Mase, K.
    Matis, H. S.
    Maunu, R.
    McNally, F.
    Meagher, K.
    Medici, M.
    Meli, A.
    Meures, T.
    Miarecki, S.
    Middell, E.
    Middlemas, E.
    Milke, N.
    Miller, J.
    Mohrmann, L.
    Montaruli, T.
    Morse, R.
    Nahnhauer, R.
    Naumann, U.
    Niederhausen, H.
    Nowicki, S. C.
    Nygren, D. R.
    Obertacke, A.
    Odrowski, S.
    Olivas, A.
    Omairat, A.
    O'Murchadha, A.
    Palczewski, T.
    Paul, L.
    Penek, Oe.
    Pepper, J. A.
    de los Heros, C. Perez
    Pfendner, C.
    Pieloth, D.
    Pinat, E.
    Posselt, J.
    Price, P. B.
    Przybylski, G. T.
    Puetz, J.
    Quinnan, M.
    Raedel, L.
    Rameez, M.
    Rawlins, K.
    Redl, P.
    Rees, I.
    Reimann, R.
    Relich, M.
    Resconi, E.
    Rhode, W.
    Richman, M.
    Riedel, B.
    Robertson, S.
    Rodrigues, Jp.
    Rongen, M.
    Rott, C.
    Ruhe, T.
    Ruzybayev, B.
    Ryckbosch, D.
    Saba, S. M.
    Sander, H. -G
    Sandroos, J.
    Santander, M.
    Sarkar, S.
    Schatto, K.
    Scheriau, F.
    Schmidt, T.
    Schmitz, M.
    Schoenen, S.
    Schoeneberg, S.
    Schoenwald, A.
    Schukraft, A.
    Schulte, L.
    Schulz, O.
    Seckel, D.
    Sestayo, Y.
    Seunarine, S.
    Shanidze, R.
    Smith, M. W. E.
    Soldin, D.
    Spiczak, G. M.
    Spiering, C.
    Stamatikos, M.
    Stanev, T.
    Stanisha, N. A.
    Stasik, A.
    Stezelberger, T.
    Stokstad, R. G.
    Stoessl, A.
    Strahler, E. A.
    Stroem, R.
    Strotjohann, N. L.
    Sullivan, G. W.
    Taavola, H.
    Taboada, I.
    Tamburro, A.
    Tepe, A.
    Ter-Antonyan, S.
    Terliuk, A.
    Tesic, G.
    Tilav, S.
    Toale, P. A.
    Tobin, M. N.
    Tosi, D.
    Tselengidou, M.
    Unger, E.
    Usner, M.
    Vallecorsa, S.
    van Eijndhoven, N.
    Vandenbroucke, J.
    van Santen, J.
    Vehring, M.
    Voge, M.
    Vraeghe, M.
    Walck, Christian
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC).
    Wallraff, M.
    Weaver, Ch.
    Wellons, M.
    Wendt, C.
    Westerhoff, S.
    Whelan, B. J.
    Whitehorn, N.
    Wichary, C.
    Wiebe, K.
    Wiebusch, C. H.
    Williams, D. R.
    Wissing, H.
    Wolf, Martin
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC).
    Wood, T. R.
    Woschnagg, K.
    Xu, D. L.
    Xu, X. W.
    Yanez, J. P.
    Yodh, G.
    Yoshida, S.
    Zarzhitsky, P.
    Ziemann, J.
    Zierke, S.
    Zoll, Marcel
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC).
    Searches for small-scale anisotropies from neutrino point sources with three years of IceCube data2015Inngår i: Astroparticle physics, ISSN 0927-6505, E-ISSN 1873-2852, Vol. 66, 39-52 s.Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Recently, IceCube found evidence for a diffuse signal of astrophysical neutrinos in an energy range of similar to 60 TeV to the PeV-scale [1]. The origin of those events, being a key to understanding the origin of cosmic rays, is still an unsolved question. So far, analyses have not succeeded to resolve the diffuse signal into point-like sources. Searches including a maximum-likelihood-ratio test, based on the reconstructed directions and energies of the detected down- and up-going neutrino candidates, were also performed on IceCube data leading to the exclusion of bright point sources. In this paper, we present two methods to search for faint neutrino point sources in three years of IceCube data, taken between 2008 and 2011. The first method is an autocorrelation test, applied separately to the northern and southern sky. The second method is a multipole analysis, which expands the measured data in the northern hemisphere into spherical harmonics and uses the resulting expansion coefficients to separate signal from background. With both methods, the results are consistent with the background expectation with a slightly more sparse spatial distribution, corresponding to an underfluctuation. Depending on the assumed number of sources, the resulting upper limit on the flux per source in the northern hemisphere for an E-2 energy spectrum ranges from similar to 1.5. 10(-8) GeV/cm(2) s(-1), in the case of one assumed source, to similar to 4. 10(-10) GeV/cm(2) s(-1), in the case of 3500 assumed sources.

  • 8. Abazov, V. M.
    et al.
    Abbott, B.
    Abolins, M.
    Åsman, Barbro
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Search for Events with Leptonic Jets and Missing Transverse Energy in p(p)over-bar Collisions at root s=1.96 TeV2010Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 105, nr 21, 211802- s.Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We present the first search for pair production of isolated jets of charged leptons in association with a large imbalance in transverse energy in pp̅ collisions using 5.8  fb-1 of integrated luminosity collected by the D0 detector at the Fermilab Tevatron Collider. No excess is observed above the standard model background, and the result is used to set upper limits on the production cross section of pairs of supersymmetric chargino and neutralino particles as a function of “dark-photon” mass, where the dark photon is produced in the decay of the lightest supersymmetric particle

  • 9. Abazov, V. M.
    et al.
    Abbott, B.
    Abolins, M.
    Åsman, Barbro
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Search for Sneutrino Production in e mu Final States in 5.3 fb(-1) of p(p)over-bar Collisions at root s = 1.96 TeV2010Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 105, nr 19, 191802- s.Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We report the results of a search for R parity violating (RPV) interactions leading to the production of supersymmetric sneutrinos decaying into eμ final states using 5.3  fb-1 of integrated luminosity collected by the D0 experiment at the Fermilab Tevatron Collider. Having observed no evidence for production of eμ resonances, we set direct bounds on the RPV couplings λ311 and λ312 as a function of sneutrino mass.

  • 10. Abdalla, H.
    et al.
    Abramowski, A.
    Aharonian, F.
    Benkhali, F. Ait
    Akhperjanian, A. G.
    Andersson, T.
    Angüner, E. O.
    Arrieta, M.
    Aubert, P.
    Backes, M.
    Balzer, A.
    Barnard, M.
    Becherini, Y.
    Tjus, J. Becker
    Berge, D.
    Bernhard, S.
    Bernlöhr, K.
    Birsin, E.
    Blackwell, R.
    Böttcher, M.
    Boisson, C.
    Bolmont, J.
    Bordas, P.
    Bregeon, J.
    Brun, F.
    Brun, P.
    Bryan, M.
    Bulik, T.
    Capasso, M.
    Carr, J.
    Casanova, S.
    Chakraborty, N.
    Chalme-Calvet, R.
    Chaves, R. C. G.
    Chen, A.
    Chevalier, J.
    Chrétien, M.
    Colafrancesco, S.
    Cologna, G.
    Condon, B.
    Conrad, Jan
    Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC). Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Couturier, C.
    Cui, Y.
    Davids, I. D.
    Degrange, B.
    Deil, C.
    Devin, J.
    de Wilt, P.
    Djannati-Ataie, A.
    Domainko, W.
    Donath, A.
    Drury, L. O'C.
    Dubus, G.
    Dutson, K.
    Dyks, J.
    Dyrda, M.
    Edwards, T.
    Egberts, K.
    Eger, P.
    Ernenwein, J. -P.
    Eschbach, S.
    Farnier, Christian
    Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC). Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Fegan, S.
    Fernandes, M. V.
    Fiasson, A.
    Fontaine, G.
    Förster, A.
    Funk, S.
    Füssling, M.
    Gabici, S.
    Gajdus, M.
    Gallant, Y. A.
    Garrigoux, T.
    Giavitto, G.
    Giebels, B.
    Glicenstein, J. F.
    Gottschall, D.
    Goyal, A.
    Grondin, M. -H.
    Grudzinska, M.
    Hadasch, D.
    Hahn, J.
    Hawkes, J.
    Heinzelmann, G.
    Henri, G.
    Hermann, G.
    Hervet, O.
    Hillert, A.
    Hinton, J. A.
    Hofmann, W.
    Hoischen, C.
    Holler, M.
    Horns, D.
    Ivascenko, A.
    Jacholkowska, A.
    Jamrozy, M.
    Janiak, M.
    Jankowsky, D.
    Jankowsky, F.
    Jingo, M.
    Jogler, T.
    Jouvin, L.
    Jung-Richardt, I.
    Kastendieck, M. A.
    Katarzynski, K.
    Katz, U.
    Kerszberg, D.
    Khélifi, B.
    Kieffer, M.
    King, J.
    Klepser, S.
    Klochkov, D.
    Kluzniak, W.
    Kolitzus, D.
    Komin, Nu.
    Kosack, K.
    Krakau, S.
    Kraus, M.
    Krayzel, F.
    Krüger, P. P.
    Laffon, H.
    Lamanna, G.
    Lau, J.
    Lees, J. -P.
    Lefaucheur, J.
    Lefranc, V.
    Lemière, A.
    Lemoine-Goumard, M.
    Lenain, J. -P.
    Leser, E.
    Liu, R.
    Lohse, T.
    Lorentz, M.
    Lypova, I.
    Marandon, V.
    Marcowith, A.
    Mariaud, C.
    Marx, R.
    Maurin, G.
    Maxted, N.
    Mayer, M.
    Meintjes, P. J.
    Meyer, Manuel
    Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC). Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Mitchell, A. M. W.
    Moderski, R.
    Mohamed, M.
    Morå, Knut
    Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC). Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Moulin, E.
    Murach, T.
    de Naurois, M.
    Niederwanger, F.
    Niemiec, J.
    Oakes, L.
    O'Brien, P.
    Odaka, H.
    Ohm, S.
    Ostrowski, M.
    Öttl, S.
    Oya, I.
    Padovani, M.
    Panter, M.
    Parsons, R. D.
    Arribas, M. Paz
    Pekeur, N. W.
    Pelletier, G.
    Perennes, C.
    Petrucci, P. -O.
    Peyaud, B.
    Pita, S.
    Poon, H.
    Prokhorov, D.
    Prokoph, H.
    Pühlhofer, G.
    Punch, M.
    Quirrenbach, A.
    Raab, S.
    Reimer, A.
    Reimer, O.
    Renaud, M.
    Reyes, R. de los
    Rieger, F.
    Romoli, C.
    Rosier-Lees, S.
    Rowell, G.
    Rudak, B.
    Rulten, C. B.
    Sahakian, V.
    Salek, D.
    Sanchez, D. A.
    Santangelo, A.
    Sasaki, M.
    Schlickeiser, R.
    Schüssler, F.
    Schulz, A.
    Schwanke, U.
    Schwemmer, S.
    Settimo, M.
    Seyffert, A. S.
    Shafi, N.
    Shilon, I.
    Simoni, R.
    Sol, H.
    Spanier, F.
    Spengler, Gerrit
    Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC). Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Spies, F.
    Stawarz, L.
    Steenkamp, R.
    Stegmann, C.
    Stinzing, F.
    Stycz, K.
    Sushch, I.
    Tavernet, J. -P.
    Tavernier, T.
    Taylor, A. M.
    Terrier, R.
    Tibaldo, L.
    Tluczykont, M.
    Trichard, C.
    Tuffs, R.
    van der Walt, J.
    van Eldik, C.
    van Soelen, B.
    Vasileiadis, G.
    Veh, J.
    Venter, C.
    Viana, A.
    Vincent, P.
    Vink, J.
    Voisin, F.
    Völk, H. J.
    Vuillaume, T.
    Wadiasingh, Z.
    Wagner, S. J.
    Wagner, P.
    Wagner, Roger M.
    Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC). Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    White, R.
    Wierzcholska, A.
    Willmann, P.
    Wörnlein, A.
    Wouters, D.
    Yang, R.
    Zabalza, V.
    Zaborov, D.
    Zacharias, M.
    Zdziarski, A. A.
    Zech, A.
    Zefi, F.
    Ziegler, A.
    Zywucka, N.
    HESS Limits on Linelike Dark Matter Signatures in the 100 GeV to 2 TeV Energy Range Close to the Galactic Center2016Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 117, nr 15, 151302Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A search for dark matter linelike signals iss performed in the vicinity of the Galactic Center by the H.E.S.S. experiment on observational data taken in 2014. An unbinned likelihood analysis iss developed to improve the sensitivity to linelike signals. The upgraded analysis along with newer data extend the energy coverage of the previous measurement down to 100 GeV. The 18 h of data collected with the H.E.S.S. array allow one to rule out at 95% C.L. the presence of a 130 GeV line (at l = -1.5 degrees, b = 0 degrees and for a dark matter profile centered at this location) previously reported in Fermi-LAT data. This new analysis overlaps significantly in energy with previous Fermi-LAT and H.E.S.S. results. No significant excess associated with dark matter annihilations was found in the energy range of 100 GeV to 2 TeV and upper limits on the gamma-ray flux and the velocity weighted annihilation cross section are derived adopting an Einasto dark matter halo profile. Expected limits for present and future large statistics H.E.S.S. observations are also given.

  • 11. Abdallah et al., DELPHI Collaboration: J
    et al.
    Moa, Torbjörn
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Investigation of Colour Reconnection in WW Events with the DELPHI detector at LEP-22007Inngår i: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 51, nr 2, 249-269 s.Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In the reaction e(+)e(-) -> WW -> (q(1) (q) over bar (2))(q(3)(q) over bar (4)) the usual hadronization models treat the colour singlets q(1)(q) over bar (2) and q(3)(q) over bar (4) coming from two W bosons independently. However, since the. nal state partons may coexist in space and time, cross-talk between the two evolving hadronic systems may be possible during fragmentation through soft gluon exchange. This e. ect is known as colour reconnection. In this article the results of the investigation of colour reconnection e. ects in fully hadronic decays of W pairs in DELPHI at LEP are presented. Two complementary analyses were performed, studying the particle. ow between jets and W mass estimators, with negligible correlation between them, and the results were combined and compared to models. In the framework of the SK-I model, the value for its. parameter most compatible with the data was found to be:

    (SK)-S-kappa-I = 2.2(-1.3) (+2.5)

    corresponding to the probability of reconnection P-reco to be in the range 0.31 < P-reco < 0.68 at 68% confidence level with its best value at 0.52.

  • 12. Abdallah et al., DELPHI Collaboration: J
    et al.
    Moa, Torbjörn
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Search for a Fourth Generation b-quark at LEP-II at sqrt(s)=196-209 GeV2007Inngår i: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 50, nr 3, 507-518 s.Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A search for the pair production of fourth generation b'-quarks was performed using data taken by the DELPHI detector at LEP-II. The analysed data were collected at centre-of-mass energies ranging from 196 to 209 GeV, corresponding to an integrated luminosity of 420 pb(-1). No evidence for a signal was found. Upper limits on BR(b'-> bZ) and BR(b'-> bZ) were obtained for b' masses ranging from 96 to 103 GeV/c(2) stop. These limits, together with the theoretical branching ratios predicted by a sequential four generations model, were used to constrain the value of R-CKM=vertical bar V-cb(') /V-tb'V-tb vertical bar there V-cb', V-tb' and V-tb are elements of the extended CKM matrix.

  • 13. Abdallah et al., DELPHI Collaboration: J
    et al.
    Moa, Torbjörn
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Study of Multi-Muon Bundles in Cosmic Ray Showers Detected with the DELPHI Detector at LEP2007Inngår i: Astroparticle physics, ISSN 0927-6505, E-ISSN 1873-2852, Vol. 28, nr 3, 273-286 s.Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The DELPHI detector at LEP has been used to measure multi-muon bundles originating from cosmic ray interactions with air. The cosmic events were recorded in "parasitic mode" between individual e(+)e(-) interactions and the total live time of this data taking is equivalent to 1.6 x 10(6) s. The DELPHI apparatus is located about 100 m underground and the 84 metres rock overburden imposes a cutoff of about 52 GeV/c on muon momenta. The data from the large volume Hadron Calorimeter allowed the muon multiplicity of 54,201 events to be reconstructed. The resulting muon multiplicity distribution is compared with the prediction of the Monte Carlo simulation based on CORSIKA/QGSJETOI. The model fails to describe the abundance of high multiplicity events. The impact of QGSJET internal parameters on the results is also studied.

  • 14. Abdallah et al., DELPHI Collaboration: J
    et al.
    Moa, Torbjörn
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Study of triple-gauge-boson couplings ZZZ, ZZ gamma and z gamma gamma at LEP2007Inngår i: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 51, nr 3, 525-542 s.Artikkel i tidsskrift (Fagfellevurdert)
  • 15. Abdallah et al., DELPHI Collaboration: J
    et al.
    Åsman, Barbro
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Berntzon, Lisa
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Dalmau, Jörgen
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Holmgren, Sven-Olof
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Hultqvist, Klas
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Johansson, E. K.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Johansson, P. D.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Leinonen, Lena
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Lipniacka, Anna
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Moa, Torbjörn
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    A Measurement of the Tau Hadronic Branching Ratios2006Inngår i: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 46, nr 1, 1-26 s.Artikkel i tidsskrift (Fagfellevurdert)
  • 16. Abdallah et al., DELPHI Collaboration: J
    et al.
    Åsman, Barbro
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Berntzon, Lisa
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Dalmau, Jörgen
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Holmgren, Sven-Olof
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Hultqvist, Klas
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Johansson, E. K.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Johansson, P. D.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Leinonen, Lena
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Lipniacka, Anna
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Moa, Torbjörn
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Evidence for an Excess of Soft Photons in Hadronic Decays of $Z^0$2006Inngår i: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 47, nr 2, 273-294 s.Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Soft photons inside hadronic jets converted in front of the DELPHI main tracker (TPC) in events of qq̄ disintegrations of the Z0 were studied in the kinematic range 0.2<Eγ<1 GeV and transverse momentum with respect to the closest jet direction pT<80 MeV/c. A clear excess of photons in the experimental data as compared to the Monte Carlo predictions is observed. This excess (uncorrected for the photon detection efficiency) is (1.17±0.06±0.27)×10-3 γ/jet in the specified kinematic region, while the expected level of the inner hadronic bremsstrahlung (which is not included in the Monte Carlo) is (0.340±0.001±0.038)×10-3 γ/jet. The ratio of the excess to the predicted bremsstrahlung rate is then (3.4±0.2±0.8), which is similar in strength to the anomalous soft photon signal observed in fixed target experiments with hadronic beams.

  • 17. Abdallah et al., DELPHI Collaboration: J
    et al.
    Åsman, Barbro
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Berntzon, Lisa
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Dalmau, Jörgen
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Holmgren, Sven-Olof
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Hultqvist, Klas
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Johansson, E. K.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Johansson, P. D.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Leinonen, Lena
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Lipniacka, Anna
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Moa, Torbjörn
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Measurement and interpretation of fermion-pair production at LEP energies above the Z resonance2006Inngår i: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 45, nr 3, 589-632 s.Artikkel i tidsskrift (Fagfellevurdert)
  • 18. Abdallah et al., DELPHI Collaboration: J
    et al.
    Åsman, Barbro
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Berntzon, Lisa
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Dalmau, Jörgen
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Holmgren, Sven-Olof
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Hultqvist, Klas
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Johansson, E. K.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Johansson, P. D.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Leinonen, Lena
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Lipniacka, Anna
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Moa, Torbjörn
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Search for Excited Leptons in in e+e- Collisions at $sqrt{s}=189-209$ GeV2006Inngår i: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 46, nr 2, 277-293 s.Artikkel i tidsskrift (Fagfellevurdert)
  • 19. Abdallah et al., DELPHI Collaboration: J
    et al.
    Åsman, Barbro
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Berntzon, Lisa
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Dalmau, Jörgen
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Holmgren, Sven-Olof
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Hultqvist, Klas
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Johansson, E. K.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Johansson, P. D.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Leinonen, Lena
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Lipniacka, Anna
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Moa, Torbjörn
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Search for ηb in two-photon collisions at LEP II with the DELPHI detector2006Inngår i: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 634, nr 4, 340-346 s.Artikkel i tidsskrift (Fagfellevurdert)
  • 20. Abdallah et al., DELPHI Collaboration: J
    et al.
    Åsman, Barbro
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Berntzon, Lisa
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Dalmau, Jörgen
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Holmgren, Sven-Olof
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Hultqvist, Klas
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Johansson, K. E.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Johansson, P. D.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Leinonen, Lena
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Lipniacka, Anna
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Moa, Torbjörn
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Determination of the b quark mass at the MZ scale with the DELPHI detector at LEP2006Inngår i: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 46, nr 3, 569-583 s.Artikkel i tidsskrift (Fagfellevurdert)
  • 21. Abdallah et al., DELPHI Collaboration: J
    et al.
    Åsman, Barbro
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Berntzon, Lisa
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Dalmau, Jörgen
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Holmgren, Sven-Olof
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Hultqvist, Klas
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Johansson, K. E.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Johansson, P. D.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Leinonen, Lena
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Lipniacka, Anna
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Moa, Torbjörn
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Study of double-tagged γγ events at LEPII2006Inngår i: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 46, nr 3, 559-568 s.Artikkel i tidsskrift (Fagfellevurdert)
  • 22. Abdallah et al., DELPHI Collaboration: J
    et al.
    Åsman, Barbro
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Berntzon, Lisa
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Dalmau, Jörgen
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Holmgren, Sven-Olof
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Hultqvist, Klas
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Johansson, K.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Johansson, D.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Leinonen, Lena
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Lipniacka, Anna
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Moa, Torbjörn
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Determination of Heavy Quark Non-Perturbative Parameters from Spectral Moments in Semileptonic B Decays2006Inngår i: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 45, nr 1, 35-59 s.Artikkel i tidsskrift (Fagfellevurdert)
  • 23. Abdallah et al., DELPHI Collaboration: J
    et al.
    Åsman, Barbro
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Berntzon, Lisa
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Dalmau, Jörgen
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Holmgren, Sven-Olof
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Hultqvist, Klas
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Johansson, K.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Johansson, D.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Leinonen, Lena
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Lipniacka, Anna
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Moa, Torbjörn
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Single Intermediate Vector Boson Production in e + e- Collisions * at $sqrt{s}= 183 - 209$ GeV2006Inngår i: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 45, nr 2, 273-289 s.Artikkel i tidsskrift (Fagfellevurdert)
  • 24. Abdallah et al., DELPHI Collaboration: J
    et al.
    Åsman, Barbro
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Berntzon, Lisa
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Dalmau, Jörgen
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Holmgren, Sven-Olof
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Johansson, E. K.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Johansson, P. D.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Leinonen, Lena
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Lipniacka, Anna
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Moa, Torbjörn
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Niss, P.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Walck, Christian
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Masses, Lifetimes and Production Rates of $Xi^-$ and $-arXi^+$ at LEP 12006Inngår i: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 639, nr 3-4, 179-191 s.Artikkel i tidsskrift (Fagfellevurdert)
  • 25. Abdallah et al., DELPHI Collaboration: J
    et al.
    Åsman, Barbro
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Berntzon, Lisa
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Dalmau, Jörgen
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Holmgren, Sven-Olof
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Johansson, Erik
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Johansson, P. D.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Leinonen, Lena
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Lipniacka, Anna
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Moa, Torbjörn
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Study of Leading Hadrons in Gluon and Quark Fragmentation2006Inngår i: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 643, nr 3-4, 147-157 s.Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The study of quark jets in e+e reactions at LEP has demonstrated that the hadronisation process is reproduced well by the Lund string model. However, our understanding of gluon fragmentation is less complete. In this study enriched quark and gluon jet samples of different purities are selected in three-jet events from hadronic decays of the Z collected by the DELPHI experiment in the LEP runs during 1994 and 1995. The leading systems of the two kinds of jets are defined by requiring a rapidity gap and their sum of charges is studied. An excess of leading systems with total charge zero is found for gluon jets in all cases, when compared to Monte Carlo simulations with JETSET (with and without Bose–Einstein correlations included) and ARIADNE. The corresponding leading systems of quark jets do not exhibit such an excess. The influence of the gap size and of the gluon purity on the effect is studied and a concentration of the excess of neutral leading systems at low invariant masses (2 GeV/c2) is observed, indicating that gluon jets might have an additional hitherto undetected fragmentation mode via a two-gluon system. This could be an indication of a possible production of gluonic states as predicted by QCD.

  • 26. Abdallah et al., DELPHI Collaboration: J
    et al.
    Åsman, Barbro
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Holmgren, Sven-Olof
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Johansson, Erik
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Leinonen, Lena
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Lipniacka, Anna
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Moa, Torbjörn
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Search for Pentaquarks in the Hadronic Decays of the Z Boson with the DELPHI Detector at LEP2007Inngår i: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 653, nr 2-4, 151-160 s.Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The quark model does not exclude states composed of more than three quarks, like pentaquark systems. Controversial evidence for such states has been published in the last years, in particular: for a strange pentaquark Theta(1540)(+); for a double-strange state, the Xi(1862)(--), subsequently called Phi(1860)--; and for a charmed state, the Theta(c)(3100)(0). If confirmed, a full pentaquark family might exist; such pentaquark states could be produced in e(+)e(-) annihilations near the Z energy. In this Letter a search for pentaquarks is described using the DELPHI detector at LEP, characterized by powerful particle identification sub-systems crucial in the separation of the signal from the background for these states. At 95% CL, upper limits are set on the production rates N of such particles and their charge-conjugate state per Z decay: N-Theta+ x Br(Theta(+) -> pK(S)(0)) < 5.1 x 10(-4), N Theta++ < 1.6 x 10(-3), N Phi(1860)-- x Br((P(1860)-- -> Xi(-)pi(-)) < 2.9 x 10(-4), N-Theta c(3100)0 x Br(Theta(c)(3100)(0) -> D*(+)p) < 8.8 x 10(-4).

  • 27. Abdallah et al., DELPHI Collaboration: J
    et al.
    Åsman, Barbro
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Holmgren, Sven-Olof
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Johansson, Erik
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Leinonen, Lena
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Lipniacka, Anna
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Moa, Torbjörn
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Z gamma* production in e(+) e(-) interactions at root s=183-209 GeV2007Inngår i: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 51, nr 3, 503-523 s.Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Measurements of Z gamma* production are presented using data collected by the DELPHI detector at centre-of-mass energies ranging from 183 to 209 GeV, corresponding to an integrated luminosity of about 667 pb(-1). The measurements cover a wide range of the possible final state four-fermion configurations: hadronic and leptonic (e(+) e(-) q (q) over bar, mu(+) mu(-) q (q) over bar ,q (q) over barv (v) over bar), fully leptonic (l(+) l(-) l' (+) l'(-)) and fully hadronic. nal states (q (q) over barq (q) over bar, with a low mass q (q$) over bar pair). Measurements of the Z gamma* cross-section for the various. nal states have been compared with the Standard Model expectations and found to be consistent within the errors. In addition, a total cross-section measurement of the l(+) l(-) l'(+)l'(-) cross-section is reported, and found to be in agreement with the prediction of the Standard Model.

  • 28. Abdallah, H.
    et al.
    Abramowski, A.
    Aharonian, F.
    Benkhali, F. Ait
    Akhperjanian, A. G.
    Anguener, E.
    Arrieta, M.
    Aubert, P.
    Backes, M.
    Balzer, A.
    Barnard, M.
    Becherini, Y.
    Tjus, J. Becker
    Berge, D.
    Bernhard, S.
    Bernloehr, K.
    Birsin, E.
    Blackwell, R.
    Bottcher, M.
    Boisson, C.
    Bolmont, J.
    Bordas, P.
    Bregeon, J.
    Brun, F.
    Brun, P.
    Bryan, M.
    Bulik, T.
    Capasso, M.
    Carr, J.
    Casanova, S.
    Chakraborty, N.
    Chalme-Calvet, R.
    Chaves, R. C. G.
    Chen, A.
    Chevalier, J.
    Chretien, M.
    Colafrancesco, S.
    Cologna, G.
    Condon, B.
    Conrad, Jan
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC). Wallenberg Academy Fellow, Sweden.
    Couturier, C.
    Cui, Y.
    Davids, I. D.
    Degrange, B.
    Deil, C.
    deWilt, P.
    Djannati-Atai, A.
    Domainko, W.
    Donath, A.
    Drury, L. O'C.
    Dubus, G.
    Dutson, K.
    Dyks, J.
    Dyrda, M.
    Edwards, T.
    Egberts, K.
    Eger, P.
    Ernenwein, J. -P.
    Eschbach, S.
    Farnier, Christian
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC).
    Fegan, S.
    Fernandes, M. V.
    Fiasson, A.
    Fontaine, G.
    Foerster, A.
    Funk, S.
    Fuessling, M.
    Gabici, S.
    Gajdus, M.
    Gallant, Y. A.
    Garrigoux, T.
    Giavitto, G.
    Giebels, B.
    Glicenstein, J. F.
    Gottschall, D.
    Goyal, A.
    Grondin, M. -H.
    Grudzinska, M.
    Hadasch, D.
    Hahn, J.
    Hawkes, J.
    Heinzelmann, G.
    Henri, G.
    Hermann, G.
    Hervet, O.
    Hillert, A.
    Hinton, J. A.
    Hofmann, W.
    Hoischen, C.
    Holler, M.
    Horns, D.
    Ivascenko, A.
    Jacholkowska, A.
    Jamrozy, M.
    Janiak, M.
    Jankowsky, D.
    Jankowsky, F.
    Jingo, M.
    Jogler, T.
    Jouvin, L.
    Jung-Richardt, I.
    Kastendieck, M. A.
    Katarzynski, K.
    Katz, U.
    Kerszberg, D.
    Khelifi, B.
    Kieffer, M.
    King, J.
    Klepser, S.
    Klochkov, D.
    Kluzniak, W.
    Kolitzus, D.
    Komin, Nu.
    Kosack, K.
    Krakau, S.
    Kraus, M.
    Krayzel, F.
    Kruger, P. P.
    Laffon, H.
    Lamanna, G.
    Lau, J.
    Lees, J. -P.
    Lefaucheur, J.
    Lefranc, V.
    Lemiere, A.
    Lemoine-Goumard, M.
    Lenain, J. -P.
    Leser, E.
    Lohse, T.
    Lorentz, M.
    Lui, R.
    Lypova, I.
    Marandon, V.
    Marcowith, A.
    Mariaud, C.
    Marx, R.
    Maurin, G.
    Maxted, N.
    Mayer, M.
    Meintjes, P. J.
    Menzler, U.
    Meyer, Manuel
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC).
    Mitchell, A. M. W.
    Moderski, R.
    Mohamed, M.
    Morå, Knut
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC).
    Moulin, E.
    Murach, T.
    de Naurois, M.
    Niederwanger, F.
    Niemiec, J.
    Oakes, L.
    Odaka, H.
    Ohm, S.
    Oettl, S.
    Ostrowski, M.
    Oya, I.
    Padovani, M.
    Panter, M.
    Parsons, R. D.
    Arribas, M. Paz
    Pekeur, N. W.
    Pelletier, G.
    Petrucci, P. -O.
    Peyaud, B.
    Pita, S.
    Poon, H.
    Prokhorov, D.
    Prokoph, H.
    Puehlhofer, G.
    Punch, M.
    Quirrenbach, A.
    Raab, S.
    Reimer, A.
    Reimer, O.
    Renaud, M.
    de los Reyes, R.
    Rieger, F.
    Romoli, C.
    Rosier-Lees, S.
    Rowell, G.
    Rudak, B.
    Rulten, C. B.
    Sahakian, V.
    Salek, D.
    Sanchez, D. A.
    Santangelo, A.
    Sasaki, M.
    Schlickeiser, R.
    Schussler, F.
    Schulz, A.
    Schwanke, U.
    Schwemmer, S.
    Seyffert, A. S.
    Shafi, N.
    Simoni, R.
    Sol, H.
    Spanier, F.
    Spengler, Gerrit
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC).
    Spiess, F.
    Stawarz, L.
    Steenkamp, R.
    Stegmann, C.
    Stinzing, F.
    Stycz, K.
    Sushch, I.
    Tavernet, J. -P.
    Tavernier, T.
    Taylor, A. M.
    Terrier, R.
    Tluczykont, M.
    Trichard, C.
    Tuffs, R.
    van der Walt, J.
    van Eldik, C.
    van Soelen, B.
    Vasileiadis, G.
    Veh, J.
    Venter, C.
    Viana, A.
    Vincent, P.
    Vink, J.
    Voisin, F.
    Voelk, H. J.
    Vuillaume, T.
    Wadiasingh, Z.
    Wagner, S. J.
    Wagner, P.
    Wagner, Robert M.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC).
    White, R.
    Wierzcholska, A.
    Willmann, P.
    Woernlein, A.
    Wouters, D.
    Yang, R.
    Zabalza, V.
    Zaborov, D.
    Zacharias, M.
    Zdziarski, A. A.
    Zech, A.
    Zefi, F.
    Ziegler, A.
    Zywucka, N.
    Search for Dark Matter Annihilations towards the Inner Galactic Halo from 10 Years of Observations with HESS2016Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 117, nr 11, 111301Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The inner region of the Milky Way halo harbors a large amount of dark matter (DM). Given its proximity, it is one of the most promising targets to look for DM. We report on a search for the annihilations of DM particles using gamma-ray observations towards the inner 300 pc of the Milky Way, with the H.E.S.S. array of ground-based Cherenkov telescopes. The analysis is based on a 2D maximum likelihood method using Galactic Center (GC) data accumulated by H.E.S.S. over the last 10 years (2004-2014), and does not show any significant gamma-ray signal above background. Assuming Einasto and Navarro-Frenk-White DM density profiles at the GC, we derive upper limits on the annihilation cross section <sigma nu >. These constraints are the strongest obtained so far in the TeV DM mass range and improve upon previous limits by a factor 5. For the Einasto profile, the constraints reach <sigma nu > values of 6 x 10(-26) cm(3) s(-1) in the W+W- channel for a DM particle mass of 1.5 TeV, and 2 x 10(-26) cm(3) s(-1) in the tau(+)tau(-) channel for a 1 TeV mass. For the first time, ground-based gamma-ray observations have reached sufficient sensitivity to probe <sigma nu > values expected from the thermal relic density for TeV DM particles.

  • 29.
    Abdallah, J.
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    , et al
    Search for SUSY in the AMSB scenario with the DELPHI detector2004Inngår i: Eur. Phys. J., Vol. C, nr 34, 145-156 s.Artikkel i tidsskrift (Fagfellevurdert)
  • 30.
    Abdallah, J.
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    , et al
    Searches for supersymmetric particles in $e^+e^-$ collisions up to 208~GeV,2003Inngår i: Eur. Phys. J., Vol. C, nr 31, 421-479 s.Artikkel i tidsskrift (Fagfellevurdert)
  • 31. Abdallah, J.
    et al.
    Adragna, P.
    Alexa, C.
    Alves, R.
    Amaral, P.
    Ananiev, A.
    Anderson, K.
    Andresen, X.
    Antonaki, A.
    Batusov, V.
    Bednar, P.
    Behrens, A.
    Bergeås, Elin
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Biscarat, C.
    Blanch, O.
    Blanchot, G.
    Blocki, J.
    Bohm, Christian
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Boldea, V.
    Bosi, F.
    Bosman, M.
    Bromberg, C.
    Brunel, B.
    Budagov, J.
    Calderon, D.
    Calvet, D.
    Cardeira, C.
    Carli, T.
    Carvalho, J.
    Cascella, M.
    Castillo, M. V.
    Costello, J.
    Cavalli-Sforza, M.
    Cavasinni, V.
    Cerqueira, A. S.
    Clément, Christophe
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. CERN, Geneva, Switzerland.
    Cobal, M.
    Cogswell, F.
    Constantinescu, S.
    Costanzo, D.
    Da Silva, P.
    David, M.
    Davidek, T.
    Dawson, J.
    De, K.
    Del Prete, T.
    Di Girolamo, B.
    Dita, S.
    Dolejsi, J.
    Dolezal, Z.
    Dotti, A.
    Downing, R.
    Drake, G.
    Efthymiopoulos, I.
    Errede, D.
    Errede, S.
    Farbin, A.
    Fassouliotis, D.
    Feng, E.
    Fenyuk, A.
    Ferdi, C.
    Ferreira, B. C.
    Ferrer, A.
    Ferrer, J.
    Flaminio, V.
    Flix, J.
    Francavilla, P.
    Fullana, E.
    Garde, V.
    Gaydee, J. C.
    Gellerstedt, Karl
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Giakoumopoulou, V.
    Giangiobbe, V.
    Gildemeister, O.
    Gilewsky, V.
    Giokaris, N.
    Gollub, N.
    Gomes, A.
    Gonzalez, V.
    Gouveia, J.
    Grenier, P.
    Gris, P.
    Grudzinski, J.
    Guarino, V.
    Guicheney, C.
    Gupta, A.
    Hakobyan, H.
    Haney, M.
    Hellman, Sten
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Henriques, A.
    Higon, E.
    Hill, N.
    Holmgren, Sven-Olof
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Hruska, I.
    Hurwitz, M.
    Huston, J.
    Jen-La Plante, I.
    Jon-And, Kerstin
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Junk, T.
    Karyukhin, A.
    Khubua, J.
    Klereborn, Jonas
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Kopikov, S.
    Korolkov, I.
    Krivkova, P.
    Kulchitsky, Y.
    Kurochkin, Y.
    Kuzhir, P.
    Lapin, V.
    Lasseure, C.
    LeCompte, T.
    Lefevre, R.
    Leitner, R.
    Li, J.
    Lyablin, M.
    Lim, H.
    Lokajicek, M.
    Lomakin, Y.
    Lourtie, P.
    Lovas, L.
    Lupi, A.
    Maidantchik, C.
    Maio, A.
    Maliukov, S.
    Manousakis, A.
    Marques, C.
    Marroquim, F.
    Martin, F.
    Mazzoni, E.
    Mergelkuhl, D.
    Merritt, F.
    Miagkov, A.
    Miller, R.
    Minashvili, I.
    Miralles, L.
    Montarou, G.
    Nemecek, S.
    Nessi, M.
    Nikitine, I.
    Nodulman, L.
    Norniella, O.
    Nyman, T.
    Onofre, A.
    Oreglia, M.
    Palan, B.
    Pallin, D.
    Pantea, D.
    Pereira, A.
    Pilcher, J.
    Pina, J.
    Pinhao, J.
    Pod, E.
    Podlyski, F.
    Portell, X.
    Poveda, J.
    Pribyl, L.
    Price, L. E.
    Proudfoot, J.
    Ramalho, M.
    Ramstedt, Magnus
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Raposeiro, L.
    Reis, J.
    Richards, R.
    Roda, C.
    Romanov, V.
    Rose-Dulcina, L.
    Rosnet, P.
    Roy, P.
    Ruiz, A.
    Rumiantsau, V.
    Russakovich, N.
    da Costa, J. Sa
    Salto, O.
    Salvachua, B.
    Sanchis, E.
    Sanders, H.
    Santoni, C.
    Santos, J.
    Saraiva, J. G.
    Sarri, F.
    Says, L. -P
    Schlager, G.
    Schlereth, J.
    Seixas, J. M.
    Sellden, Björn
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Shalanda, N.
    Shchelchkov, A.
    Shevtsov, P.
    Shochet, M.
    Silva, J.
    Simaitis, V.
    Simonyan, M.
    Sissakian, A.
    Sjölin, Jörgen
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Skrzecz, F.
    Solans, C.
    Solodkov, A.
    Solovianov, O.
    Sorokina, J.
    Sosebee, M.
    Spano, F.
    Speckmeyer, P.
    Stanek, R.
    Starchenko, E.
    Starovoitov, P.
    Suk, M.
    Sykora, I.
    Tang, F.
    Tas, P.
    Teuscher, R.
    Tokar, S.
    Topilin, N.
    Torres, J.
    Underwood, D.
    Usai, G.
    Utkin, V.
    Valero, A.
    Valkar, S.
    Valls, J. A.
    Vartapetian, A.
    Vazeille, F.
    Vellidis, C.
    Ventura, F.
    Vichou, I.
    Vivarelli, I.
    Volpi, M.
    White, A.
    Wood, K.
    Zaitsev, A.
    Zenin, A.
    Zenis, T.
    Zenonos, Z.
    Zenz, S.
    Zilka, B.
    Mechanical construction and installation of the ATLAS tile calorimeter2013Inngår i: Journal of Instrumentation, ISSN 1748-0221, E-ISSN 1748-0221, Vol. 8, T11001- s.Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This paper summarises the mechanical construction and installation of the Tile Calorimeter for the ATLAS experiment at the Large Hadron Collider in CERN, Switzerland. The Tile Calorimeter is a sampling calorimeter using scintillator as the sensitive detector and steel as the absorber and covers the central region of the ATLAS experiment up to pseudorapidities +/- 1.7. The mechanical construction of the Tile Calorimeter occurred over a period of about 10 years beginning in 1995 with the completion of the Technical Design Report and ending in 2006 with the installation of the final module in the ATLAS cavern. During this period approximately 2600 metric tons of steel were transformed into a laminated structure to form the absorber of the sampling calorimeter. Following instrumentation and testing, which is described elsewhere, the modules were installed in the ATLAS cavern with a remarkable accuracy for a structure of this size and weight.

  • 32. Abdallah, J.
    et al.
    Adragna, P.
    Alexa, C.
    Alves, R.
    Amaral, P.
    Ananiev, A.
    Anderson, K.
    Andresen, X.
    Antonaki, A.
    Batusov, V.
    Bednar, P.
    Bergeås, Elin
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Biscarat, C.
    Blanch, O.
    Blanchot, G.
    Bohm, Christian
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Boldea, V.
    Bosi, F.
    Bosman, M.
    Bromberg, C.
    Budagov, J.
    Calvet, D.
    Cardeira, C.
    Carli, T.
    Carvalho, J.
    Cascella, M.
    Castillo, M. V.
    Costelo, J.
    Cavalli-Sforza, M.
    Cavasinni, V.
    Cerqueira, A. S.
    Clément, Christophe
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Cobal, M.
    Cogswell, F.
    Constantinescu, S.
    Costanzo, D.
    Da Silva, P.
    David, M.
    Davidek, T.
    Dawson, J.
    De, K.
    Del Prete, T.
    Diakov, E.
    Di Girolamo, B.
    Dita, S.
    Dolejsi, J.
    Dolezal, Z.
    Dotti, A.
    Downing, R.
    Drake, G.
    Efthymiopoulos, I.
    Errede, D.
    Errede, S.
    Farbin, A.
    Fassouliotis, D.
    Feng, E.
    Fenyuk, A.
    Ferdi, C.
    Ferreira, B. C.
    Ferrer, A.
    Flaminio, V.
    Flix, J.
    Francavilla, P.
    Fullana, E.
    Garde, V.
    Gellerstedt, Karl
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Giakoumopoulou, V.
    Giangiobbe, V.
    Gildemeister, O.
    Gilewsky, V.
    Giokaris, N.
    Gollub, N.
    Gomes, A.
    Gonzalez, V.
    Gouveia, J.
    Grenier, P.
    Gris, P.
    Guarino, V.
    Guicheney, C.
    Gupta, A.
    Hakobyan, H.
    Haney, M.
    Hellman, Sten
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Henriques, A.
    Higon, E.
    Hill, N.
    Holmgren, Sven-Olof
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Hruska, I.
    Hurwitz, M.
    Huston, J.
    Plante, I. Jen-La
    Jon-And, Kerstin
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Junk, T.
    Karyukhin, A.
    Khubua, J.
    Klereborn, Jonas
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Konstantinov, V.
    Kopikov, S.
    Korolkov, I.
    Krivkova, P.
    Kulchitsky, Y.
    Kurochkin, Yu
    Kuzhir, P.
    Lapin, V.
    LeCompte, T.
    Lefevre, R.
    Leitner, R.
    Li, J.
    Liablin, M.
    Lokajicek, M.
    Lomakin, Y.
    Lourtie, P.
    Lovas, L.
    Lupi, A.
    Maidantchik, C.
    Maio, A.
    Maliukov, S.
    Manousakis, A.
    Marques, C.
    Marroquim, F.
    Martin, F.
    Mazzoni, E.
    Merritt, F.
    Miagkov, A.
    Miller, R.
    Minashvili, I.
    Miralles, L.
    Montarou, G.
    Nemecek, S.
    Nessi, M.
    Nikitine, I.
    Nodulman, L.
    Norniella, O.
    Onofre, A.
    Oreglia, M.
    Palan, B.
    Pallin, D.
    Pantea, D.
    Pereira, A.
    Pilcher, J.
    Pina, J.
    Pinhao, J.
    Pod, E.
    Podlyski, F.
    Portell, X.
    Poveda, J.
    Pribyl, L.
    Price, E.
    Proudfoot, J.
    Ramalho, M.
    Ramstedt, Magnus
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Raposeiro, L.
    Reis, J.
    Richards, R.
    Roda, C.
    Romanov, V.
    Rosnet, P.
    Roy, P.
    Ruiz, A.
    Rumiantsau, V.
    Russakovich, N.
    Da Costa, J. Sa
    Salto, O.
    Salvachua, B.
    Sanchis, E.
    Sanders, H.
    Santoni, C.
    Santos, J.
    Saraiva, J. G.
    Sarri, F.
    Says, L. -P
    Schlager, G.
    Schlereth, J.
    Seixas, J. M.
    Sellden, Björn
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Shalanda, N.
    Shevtsov, P.
    Shochet, M.
    Silva, J.
    Simaitis, V.
    Simonyan, M.
    Sissakian, A.
    Sjölin, Jörgen
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Solans, C.
    Solodkov, A.
    Solovianov, O.
    Sosebee, M.
    Spano, F.
    Speckmeyer, P.
    Stanek, R.
    Starchenko, E.
    Starovoitov, P.
    Suk, M.
    Sykora, I.
    Tang, F.
    Tas, P.
    Teuscher, R.
    Tischenko, M.
    Tokar, S.
    Topilin, N.
    Torres, J.
    Underwood, D.
    Usai, G.
    Valero, A.
    Valkar, S.
    Valls, J. A.
    Vartapetian, A.
    Vazeille, F.
    Vellidis, C.
    Ventura, F.
    Vichou, I.
    Vivarelli, I.
    Volpi, M.
    White, A.
    Zaitsev, A.
    Zaytsev, Yu
    Zenin, A.
    Zenis, T.
    Zenonos, Z.
    Zenz, S.
    Zilka, B.
    The optical instrumentation of the ATLAS Tile Calorimeter2013Inngår i: Journal of Instrumentation, ISSN 1748-0221, E-ISSN 1748-0221, Vol. 8, P01005- s.Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The Tile Calorimeter, covering the central region of the ATLAS experiment up to pseudorapidities of +/-1.7, is a sampling device built with scintillating tiles that alternate with iron plates. The light is collected in wave-length shifting (WLS) fibers and is read out with photomultipliers. In the characteristic geometry of this calorimeter the tiles lie in planes perpendicular to the beams, resulting in a very simple and modular mechanical and optical layout. This paper focuses on the procedures applied in the optical instrumentation of the calorimeter, which involved the assembly of about 460,000 scintillator tiles and 550,000 WLS fibers. The outcome is a hadronic calorimeter that meets the ATLAS performance requirements, as shown in this paper.

  • 33. Abdel-Aty, M.
    et al.
    Larson, Jonas
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Nordiska institutet för teoretisk fysik (Nordita).
    Eleuch, H.
    Obada, A. S. F.
    Multi-particle entanglement of charge qubits coupled to a nanoresonator2011Inngår i: Physica. E, Low-Dimensional systems and nanostructures, ISSN 1386-9477, E-ISSN 1873-1759, Vol. 43, nr 9, 1625-1630 s.Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The dynamics of charge qubits coupled to a nanomechanical resonator under the influence of both a phonon bath in contact with the resonator and irreversible decay of the qubits is considered. The focus of our analysis is devoted to multi-particle entanglement and the effects arising from the coupling to the reservoir. Even in the presence of the reservoirs, the inherent entanglement is found to be rather robust. Due to this fact, together with control of system parameters, the system may, therefore, be especially suited for quantum information processing. Our findings also shed light on the evolution of open quantum many-body systems. For instance, due to intrinsic qubit-qubit couplings our model is related to a driven XY spin model.

  • 34. Abdesselam, A.
    et al.
    Belyaev, A.
    Kuutmann, E. Bergeaas
    Bitenc, U.
    Brooijmans, G.
    Butterworth, J.
    de Renstrom, P. Bruckman
    Franzosi, D. Buarque
    Buckingham, R.
    Chapleau, B.
    Dasgupta, M.
    Davison, A.
    Dolen, J.
    Ellis, S.
    Fassi, F.
    Ferrando, J.
    Frandsen, M. T.
    Frost, J.
    Gadfort, T.
    Glover, N.
    Haas, A.
    Halkiadakis, E.
    Hamilton, K.
    Hays, C.
    Hill, C.
    Jackson, J.
    Issever, C.
    Karagoz, M.
    Katz, A.
    Kreczko, L.
    Krohn, D.
    Lewis, A.
    Livermore, S.
    Loch, P.
    Maksimovic, P.
    March-Russell, J.
    Martin, A.
    McCubbin, N.
    Newbold, D.
    Ott, J.
    Perez, G.
    Policchio, A.
    Rappoccio, S.
    Raklev, A. R.
    Richardson, P.
    Salam, G. P.
    Sannino, F.
    Santiago, J.
    Schwartzman, A.
    Shepherd-Themistocleous, C.
    Sinervo, P.
    Sjölin, Jörgen
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC).
    Son, M.
    Spannowsky, M.
    Strauss, E.
    Takeuchi, M.
    Tseng, J.
    Tweedie, B.
    Vermilion, C.
    Voigt, J.
    Vos, M.
    Wacker, J.
    Wagner-Kuhr, J.
    Wilson, M. G.
    Boosted objects: a probe of beyond the standard model physics2011Inngår i: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 71, nr 6, 1661- s.Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We present the report of the hadronic working group of the BOOST2010 workshop held at the University of Oxford in June 2010. The first part contains a review of the potential of hadronic decays of highly boosted particles as an aid for discovery at the LHC and a discussion of the status of tools developed to meet the challenge of reconstructing and isolating these topologies. In the second part, we present new results comparing the performance of jet grooming techniques and top tagging algorithms on a common set of benchmark channels. We also study the sensitivity of jet substructure observables to the uncertainties in Monte Carlo predictions.

  • 35. Abdo, A. A.
    et al.
    Ackermann, M.
    Ajello, M.
    Allafort, A.
    Amin, M. A.
    Baldini, L.
    Barbiellini, G.
    Bastieri, D.
    Bechtol, K.
    Bellazzini, R.
    Blandford, R. D.
    Bonamente, E.
    Borgland, A. W.
    Bregeon, J.
    Brigida, M.
    Buehler, R.
    Bulmash, D.
    Buson, S.
    Caliandro, G. A.
    Cameron, R. A.
    Caraveo, P. A.
    Cavazzuti, E.
    Cecchi, C.
    Charles, E.
    Cheung, C. C.
    Chiang, J.
    Chiaro, G.
    Ciprini, S.
    Claus, R.
    Cohen-Tanugi, J.
    Conrad, Jan
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC). The Royal Swedish Academy of Sciences KTH, Sweden.
    Corbet, R. H. D.
    Cutini, S.
    D'Ammando, F.
    de Angelis, A.
    de Palma, F.
    Dermer, C. D.
    Drell, P. S.
    Drlica-Wagner, A.
    Favuzzi, C.
    Finke, J.
    Focke, W. B.
    Fukazawa, Y.
    Fusco, P.
    Gargano, F.
    Gasparrini, D.
    Gehrels, N.
    Giglietto, N.
    Giordano, F.
    Giroletti, M.
    Glanzman, T.
    Grenier, I. A.
    Grove, J. E.
    Guiriec, S.
    Hadasch, D.
    Hayashida, M.
    Hays, E.
    Hughes, R. E.
    Inoue, Y.
    Jackson, M. S.
    Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC). Royal Institute of Technology KTH, Sweden.
    Jogler, T.
    Johannesson, G.
    Johnson, A. S.
    Kamae, T.
    Knoedlseder, J.
    Kuss, M.
    Lande, J.
    Larsson, S.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC). Université de Toulouse, France.
    Latronico, L.
    Longo, F.
    Loparco, F.
    Lott, B.
    Lovellette, M. N.
    Lubrano, P.
    Madejski, G. M.
    Mazziotta, M. N.
    Mehault, J.
    Michelson, P. F.
    Mizuno, T.
    Monzani, M. E.
    Morselli, A.
    Moskalenko, I. V.
    Murgia, S.
    Nemmen, R.
    Nuss, E.
    Ohno, M.
    Ohsugi, T.
    Paneque, D.
    Perkins, J. S.
    Pesce-Rollins, M.
    Piron, F.
    Pivato, G.
    Porter, T. A.
    Raino, S.
    Rando, R.
    Razzano, M.
    Reimer, A.
    Reimer, O.
    Reyes, L. C.
    Ritz, S.
    Romoli, C.
    Roth, M.
    Parkinson, P. M. Saz
    Sgro, C.
    Siskind, E. J.
    Spandre, G.
    Spinelli, P.
    Takahashi, H.
    Takeuchi, Y.
    Tanaka, T.
    Thayer, J. G.
    Thayer, J. B.
    Thompson, D. J.
    Tibaldo, L.
    Tinivella, M.
    Torres, D. F.
    Tosti, G.
    Troja, E.
    Tronconi, V.
    Usher, T. L.
    Vandenbroucke, J.
    Vasileiou, V.
    Vianello, G.
    Vitale, V.
    Waite, A. P.
    Werner, M.
    Winer, B. L.
    Wood, K. S.
    GAMMA-RAY FLARING ACTIVITY FROM THE GRAVITATIONALLY LENSED BLAZAR PKS 1830-211 OBSERVED BY Fermi LAT2015Inngår i: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 799, nr 2, 143Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The Large Area Telescope ( LAT) on board the FermiGamma- ray Space Telescope routinely detects the MeV- peaked flat- spectrum radio quasar PKS 1830- 211 ( z = 2.507). Its apparent isotropic. - ray luminosity ( E > 100 MeV), averaged over 3 years of observations and peaking on 2010 October 14/ 15 at 2.9 x 1050 erg s- 1, makes it among the brightest high- redshift Fermi blazars. No published model with a single lens can account for all of the observed characteristics of this complex system. Based on radio observations, one expects time- delayed variability to follow about 25 days after a primary flare, with flux about a factor of 1.5 less. Two large. - ray flares of PKS 1830- 211 have been detected by the LAT in the considered period, and no substantial evidence for such a delayed activity was found. This allows us to place a lower limit of about 6 on the. - ray flux ratio between the two lensed images. Swift XRT observations from a dedicated Target of Opportunity program indicate a hard spectrum with no significant correlation of X- ray flux with the. - ray variability. The spectral energy distribution can be modeled with inverse Compton scattering of thermal photons from the dusty torus. The implications of the LAT data in terms of variability, the lack of evident delayed flare events, and different radio and. - ray flux ratios are discussed. Microlensing effects, absorption, size and location of the emitting regions, the complex mass distribution of the system, an energy- dependent inner structure of the source, and flux suppression by the lens galaxy for one image path may be considered as hypotheses for understanding our results.

  • 36. Abdo, A. A.
    et al.
    Ackermann, M.
    Ajello, M.
    Allafort, A.
    Asano, K.
    Baldini, L.
    Ballet, J.
    Barbiellini, G.
    Baring, M. G.
    Bastieri, D.
    Bechtol, K.
    Bellazzini, R.
    Berenji, B.
    Blandford, R. D.
    Bloom, E. D.
    Bonamente, E.
    Borgland, A. W.
    Bregeon, J.
    Brez, A.
    Brigida, M.
    Bruel, P.
    Buson, S.
    Caliandro, G. A.
    Cameron, R. A.
    Camilo, F.
    Caraveo, P. A.
    Carrigan, S.
    Casandjian, J. M.
    Cecchi, C.
    Celik, Oe
    Chekhtman, A.
    Cheung, C. C.
    Chiang, J.
    Ciprini, S.
    Claus, R.
    Cohen-Tanugi, J.
    Conrad, Jan
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    den Hartog, P. R.
    Dermer, C. D.
    de Luca, A.
    de Palma, F.
    Dormody, M.
    do Couto e Silva, E.
    Drell, P. S.
    Dubois, R.
    Dumora, D.
    Farnier, C.
    Favuzzi, C.
    Fegan, S. J.
    Ferrara, E. C.
    Focke, W. B.
    Frailis, M.
    Fukazawa, Y.
    Funk, S.
    Fusco, P.
    Gargano, F.
    Gehrels, N.
    Germani, S.
    Giglietto, N.
    Giordano, F.
    Glanzman, T.
    Godfrey, G.
    Gotthelf, E. V.
    Grenier, I. A.
    Grondin, M. -H
    Grove, J. E.
    Guillemot, L.
    Guiriec, S.
    Hanabata, Y.
    Harding, A. K.
    Hays, E.
    Hobbs, G.
    Horan, D.
    Hughes, R. E.
    Johannesson, G.
    Johnson, A. S.
    Johnson, T. J.
    Johnson, W. N.
    Johnston, S.
    Kamae, T.
    Kanai, Y.
    Kanbach, G.
    Katagiri, H.
    Kataoka, J.
    Kawai, N.
    Keith, M.
    Kerr, M.
    Knoedlseder, J.
    Kuss, M.
    Lande, J.
    Latronico, L.
    Lemoine-Goumard, M.
    Garde, Maja Llena
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Longo, F.
    Loparco, F.
    Lott, B.
    Lovellette, M. N.
    Lubrano, P.
    Makeev, A.
    Manchester, R. N.
    Marelli, M.
    Mazziotta, M. N.
    McEnery, J. E.
    Michelson, P. F.
    Mitthumsiri, W.
    Mizuno, T.
    Moiseev, A. A.
    Monte, C.
    Monzani, M. E.
    Morselli, A.
    Moskalenko, I. V.
    Murgia, S.
    Nakamori, T.
    Nolan, P. L.
    Norris, J. P.
    Nuss, E.
    Ohno, M.
    Ohsugi, T.
    Omodei, N.
    Orlando, E.
    Ormes, J. F.
    Paneque, D.
    Panetta, J. H.
    Parent, D.
    Pelassa, V.
    Pepe, M.
    Pesce-Rollins, M.
    Piron, F.
    Porter, T. A.
    Raino, S.
    Rando, R.
    Razzano, M.
    Rea, N.
    Reimer, A.
    Reimer, O.
    Reposeur, T.
    Rodriguez, A. Y.
    Romani, R. W.
    Roth, M.
    Ryde, F.
    Sadrozinski, H. F. -W
    Sander, A.
    Parkinson, P. M. Saz
    Sgro, C.
    Siskind, E. J.
    Smith, D. A.
    Smith, P. D.
    Spandre, G.
    Spinelli, P.
    Starck, J. -L
    Strickman, M. S.
    Suson, D. J.
    Takahashi, H.
    Takahashi, T.
    Tanaka, T.
    Thayer, J. B.
    Thayer, J. G.
    Thompson, D. J.
    Thorsett, S. E.
    Tibaldo, L.
    Torres, D. F.
    Tosti, G.
    Tramacere, A.
    Uchiyama, Y.
    Usher, T. L.
    Vasileiou, V.
    Venter, C.
    Vilchez, N.
    Vitale, V.
    Waite, A. P.
    Wang, P.
    Weltevrede, P.
    Winer, B. L.
    Wood, K. S.
    Yang, Zhaoyu
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Ylinen, T.
    Ziegler, M.
    DETECTION OF THE ENERGETIC PULSAR PSR B1509-58 AND ITS PULSAR WIND NEBULA IN MSH 15-52 USING THE FERMI-LARGE AREA TELESCOPE2010Inngår i: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 714, nr 1, 927-936 s.Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We report the detection of high-energy gamma-ray emission from the young and energetic pulsar PSR B1509-58 and its pulsar wind nebula (PWN) in the composite supernova remnant G320.4-1.2 (aka MSH 15-52). Using 1 yr of survey data with the Fermi-Large Area Telescope (LAT), we detected pulsations from PSR B1509-58 up to 1 GeV and extended gamma-ray emission above 1 GeV spatially coincident with the PWN. The pulsar light curve presents two peaks offset from the radio peak by phases 0.96 +/- 0.01 and 0.33 +/- 0.02. New constraining upper limits on the pulsar emission are derived below 1 GeV and confirm a severe spectral break at a few tens of MeV. The nebular spectrum in the 1-100 GeV energy range is well described by a power law with a spectral index of (1.57 +/- 0.17 +/- 0.13) and a flux above 1 GeV of (2.91 +/- 0.79 +/- 1.35) x 10(-9) cm(-2) s(-1). The first errors represent the statistical errors on the fit parameters, while the second ones are the systematic uncertainties. The LAT spectrum of the nebula connects nicely with Cherenkov observations, and indicates a spectral break between GeV and TeV energies.

  • 37. Abdo, A. A.
    et al.
    Ackermann, M.
    Ajello, M.
    Allafort, A.
    Baldini, L.
    Ballet, J.
    Barbiellini, G.
    Baring, M. G.
    Bastieri, D.
    Baughman, B. M.
    Bechtol, K.
    Bellazzini, R.
    Berenji, B.
    Blandford, R. D.
    Bloom, E. D.
    Bonamente, E.
    Borgland, A. W.
    Bregeon, J.
    Brez, A.
    Brigida, M.
    Bruel, P.
    Buehler, R.
    Burnett, T. H.
    Busetto, G.
    Caliandro, G. A.
    Cameron, R. A.
    Caraveo, P. A.
    Casandjian, J. M.
    Cecchi, C.
    Celik, Oe.
    Charles, E.
    Chaty, S.
    Chekhtman, A.
    Cheung, C. C.
    Chiang, J.
    Cillis, A. N.
    Ciprini, S.
    Claus, R.
    Cohen-Tanugi, J.
    Conrad, Jan
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Corbel, S.
    de Palma, F.
    Digel, S. W.
    Dormody, M.
    do Couto e Silva, E.
    Drell, P. S.
    Dubois, R.
    Dumora, D.
    Edmonds, Y.
    Farnier, C.
    Favuzzi, C.
    Fegan, S. J.
    Ferrara, E. C.
    Focke, W. B.
    Fortin, P.
    Frailis, M.
    Fukazawa, Y.
    Funk, S.
    Fusco, P.
    Gargano, F.
    Gasparrini, D.
    Gehrels, N.
    Germani, S.
    Giavitto, G.
    Giglietto, N.
    Giordano, F.
    Glanzman, T.
    Godfrey, G.
    Grenier, I. A.
    Grondin, M. -H
    Grove, J. E.
    Guillemot, L.
    Guiriec, S.
    Hanabata, Y.
    Hays, E.
    Harding, A. K.
    Hayashida, M.
    Horan, D.
    Hughes, R. E.
    Jackson, M. S.
    Johnson, A. S.
    Johnson, T. J.
    Johnson, W. N.
    Kamae, T.
    Katagiri, H.
    Kataoka, J.
    Kawai, N.
    Kerr, M.
    Knoedlseder, J.
    Kuss, M.
    Lande, J.
    Latronico, L.
    Lemoine-Goumard, M.
    Longo, F.
    Loparco, F.
    Lott, B.
    Lovellette, M. N.
    Lubrano, P.
    Makeev, A.
    Mazziotta, M. N.
    Meurer, C.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Michelson, P. F.
    Mitthumsiri, W.
    Mizuno, T.
    Monte, C.
    Monzani, M. E.
    Morselli, A.
    Moskalenko, I. V.
    Murgia, S.
    Nakamori, T.
    Nolan, P. L.
    Norris, J. P.
    Nuss, E.
    Ohsugi, T.
    Okumura, A.
    Omodei, N.
    Orlando, E.
    Ormes, J. F.
    Paneque, D.
    Panetta, J. H.
    Pelassa, V.
    Pepe, M.
    Pesce-Rollins, M.
    Piron, F.
    Pohl, M.
    Porter, T. A.
    Raino, S.
    Rando, R.
    Reimer, A.
    Reimer, O.
    Reposeur, T.
    Ritz, S.
    Rodriguez, A. Y.
    Romani, R. W.
    Roth, M.
    Sadrozinski, H. F. -W
    Sander, A.
    Parkinson, P. M. Saz
    Scargle, J. D.
    Sgro, C.
    Siskind, E. J.
    Smith, D. A.
    Smith, P. D.
    Spinelli, P.
    Strickman, M. S.
    Suson, D. J.
    Tajima, H.
    Takahashi, T.
    Tanaka, T.
    Thayer, J. B.
    Thayer, J. G.
    Thompson, D. J.
    Thorsett, S. E.
    Tibaldo, L.
    Tibolla, O.
    Torres, D. F.
    Tosti, G.
    Tramacere, A.
    Uchiyama, Y.
    Usher, T. L.
    Van Etten, A.
    Vasileiou, V.
    Venter, C.
    Vilchez, N.
    Vitale, V.
    Waite, A. P.
    Wang, P.
    Winer, B. L.
    Wood, K. S.
    Yamazaki, R.
    Ylinen, T.
    Ziegler, M.
    FERMI-LAT DISCOVERY OF GeV GAMMA-RAY EMISSION FROM THE YOUNG SUPERNOVA REMNANT CASSIOPEIA A2010Inngår i: The Astrophysical Journal Letters, ISSN 0004-6388, Vol. 710, nr 1, l92-L97 s.Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]