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  • 1. Aprile, E.
    et al.
    Aalbers, Jelle
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). Nikhef and the University of Amsterdam, The Netherlands.
    Agostini, F.
    Alfonsi, M.
    Althueser, L.
    Amaro, F. D.
    Anthony, M.
    Antochi, Vasile Cristian
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Arneodo, F.
    Baudis, L.
    Bauermeister, Boris
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Benabderrahmane, L.
    Berger, T.
    Breur, P. A.
    Brown, A.
    Brown, A.
    Brown, E.
    Bruenner, S.
    Bruno, G.
    Budnik, R.
    Capelli, C.
    Cardoso, J. M. R.
    Cichon, D.
    Coderre, D.
    Colijn, A. P.
    Conrad, Jan
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Cussonneau, J. P.
    Decowski, M. P.
    de Perio, P.
    Di Gangi, P.
    Di Giovanni, A.
    Diglio, S.
    Elykov, A.
    Eurin, G.
    Fei, J.
    Ferella, Alfredo D.
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Fieguth, A.
    Fulgione, W.
    Rosso, A. Gallo
    Galloway, M.
    Gao, F.
    Garbini, M.
    Grandi, L.
    Greene, Z.
    Hasterok, C.
    Hogenbirk, E.
    Howlett, J.
    Iacovacci, M.
    Itay, R.
    Joerg, F.
    Kaminsky, B.
    Kazama, S.
    Kish, A.
    Koltman, G.
    Kopec, A.
    Landsman, H.
    Lang, R. F.
    Levinson, L.
    Lin, Q.
    Lindemann, S.
    Lindner, M.
    Lombardi, F.
    Lopes, J. A. M.
    Fune, E. Lopez
    Macolino, C.
    Mahlstedt, Jörn
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Manfredini, A.
    Marignetti, F.
    Undagoitia, T. Marrodan
    Masbou, J.
    Masson, D.
    Mastroianni, S.
    Messina, M.
    Micheneau, K.
    Miller, K.
    Molinario, A.
    Morå, Knut
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Murra, M.
    Naganoma, J.
    Ni, K.
    Oberlack, U.
    Odgers, K.
    Pelssers, Bart
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Peres, R.
    Piastra, F.
    Pienaar, J.
    Pizzella, V.
    Plante, G.
    Podviianiuk, R.
    Priel, N.
    Qiu, H.
    Garcia, D. Ramirez
    Reichard, S.
    Riedel, B.
    Rizzo, A.
    Rocchetti, A.
    Rupp, N.
    dos Santos, J. M. F.
    Sartorelli, G.
    Sarcevic, N.
    Scheibelhut, M.
    Schindler, S.
    Schreiner, J.
    Schulte, D.
    Schumann, M.
    Lavina, L. Scotto
    Selvi, M.
    Shagin, P.
    Shockley, E.
    Silva, M.
    Simgen, H.
    Therreau, C.
    Thers, D.
    Toschi, F.
    Trinchero, G.
    Tunnell, C.
    Upole, N.
    Vargas, M.
    Wack, O.
    Wang, H.
    Wang, Z.
    Wei, Y.
    Weinheimer, C.
    Wenz, D.
    Wittweg, C.
    Wulf, J.
    Ye, J.
    Zhang, Y.
    Zhu, T.
    Zopounidis, J. P.
    Observation of two-neutrino double electron capture in Xe-124 with XENON1T2019In: Nature, ISSN 0028-0836, E-ISSN 1476-4687, Vol. 568, no 7753, p. 532-535Article in journal (Refereed)
    Abstract [en]

    Two-neutrino double electron capture (2 nu ECEC) is a second-order weak-interaction process with a predicted half-life that surpasses the age of the Universe by many orders of magnitude(1). Until now, indications of 2 nu ECEC decays have only been seen for two isotopes(2-5), Kr-78 and Ba-130, and instruments with very low background levels are needed to detect them directly with high statistical significance(6,7). The 2 nu ECEC half-life is an important observable for nuclear structure models(8-14) and its measurement represents a meaningful step in the search for neutrinoless double electron capture-the detection of which would establish the Majorana nature of the neutrino and would give access to the absolute neutrino mass(15-17). Here we report the direct observation of 2 nu ECEC in Xe-124 with the XENON1T dark-matter detector. The significance of the signal is 4.4 standard deviations and the corresponding half-life of 1.8 x 10(22) years (statistical uncertainty, 0.5 x 10(22) years; systematic uncertainty, 0.1 x 10(22) years) is the longest measured directly so far. This study demonstrates that the low background and large target mass of xenon-based dark-matter detectors make them well suited for measuring rare processes and highlights the broad physics reach of larger next-generation experiments(18-20).

  • 2. Aprile, E.
    et al.
    Aalbers, Jelle
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). Nikhef and the University of Amsterdam, Netherland.
    Agostini, F.
    Alfonsi, M.
    Althueser, L.
    Amaro, F. D.
    Anthony, M.
    Antochi, Vasile Cristian
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Arneodo, F.
    Baudis, L.
    Bauermeister, Boris
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Benabderrahmane, M. L.
    Berger, T.
    Breur, P. A.
    Brown, A.
    Brown, A.
    Brown, E.
    Bruenner, S.
    Bruno, G.
    Budnik, R.
    Capelli, C.
    Cardoso, J. M. R.
    Cichon, D.
    Coderre, D.
    Colijn, A. P.
    Conrad, Jan
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Cussonneau, J. P.
    Decowski, M. P.
    de Perio, P.
    Di Gangi, P.
    Di Giovanni, A.
    Diglio, S.
    Elykov, A.
    Eurin, G.
    Fei, J.
    Ferella, Alfredo D.
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Fieguth, A.
    Fulgione, W.
    Rosso, A. Gallo
    Galloway, M.
    Gao, F.
    Garbini, M.
    Grandi, L.
    Greene, Z.
    Hasterok, C.
    Hogenbirk, E.
    Howlett, J.
    Iacovacci, M.
    Itay, R.
    Joerg, F.
    Kaminsky, B.
    Kazama, S.
    Kish, A.
    Koltman, G.
    Kopec, A.
    Landsman, H.
    Lang, R. F.
    Levinson, L.
    Lin, Q.
    Lindemann, S.
    Lindner, M.
    Lombardi, F.
    Lopes, J. A. M.
    Fune, E. Lopez
    Macolino, C.
    Mahlstedt, Jörn
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Manfredini, A.
    Marignetti, F.
    Undagoitia, T. Marrodan
    Masbou, J.
    Masson, D.
    Mastroianni, S.
    Messina, M.
    Micheneau, K.
    Miller, K.
    Molinario, A.
    Morå, Knut
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Murra, M.
    Naganoma, J.
    Ni, K.
    Oberlack, U.
    Odgers, K.
    Pelssers, Bart
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Piastra, F.
    Pienaar, J.
    Pizzella, V.
    Plante, G.
    Podviianiuk, R.
    Priel, N.
    Qiu, H.
    Garcia, D. Ramirez
    Reichard, S.
    Riedel, B.
    Rizzo, A.
    Rocchetti, A.
    Rupp, N.
    dos Santos, J. M. F.
    Sartorelli, G.
    Sarcevic, N.
    Scheibelhut, M.
    Schindler, S.
    Schreiner, J.
    Schulte, D.
    Schumann, M.
    Lavina, L. Scotto
    Selvi, M.
    Shagin, P.
    Shockley, E.
    Silva, M.
    Simgen, H.
    Therreau, C.
    Thers, D.
    Toschi, F.
    Trinchero, G.
    Tunnell, C.
    Upole, N.
    Vargas, M.
    Wack, O.
    Wang, H.
    Wang, Z.
    Wei, Y.
    Weinheimer, C.
    Wenz, D.
    Wittweg, C.
    Wulf, J.
    Ye, J.
    Zhang, Y.
    Zhu, T.
    Zopounidis, J. P.
    Hoferichter, M.
    Klos, P.
    Menendez, J.
    Schwenk, A.
    First Results on the Scalar WIMP-Pion Coupling, Using the XENON1T Experiment2019In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 122, no 7, article id 071301Article in journal (Refereed)
    Abstract [en]

    We present first results on the scalar coupling of weakly interacting massive particles (WIMPs) to pions from 1 t yr of exposure with the XENON1T experiment. This interaction is generated when the WIMP couples to a virtual pion exchanged between the nucleons in a nucleus. In contrast to most nonrelativistic operators, these pion-exchange currents can be coherently enhanced by the total number of nucleons and therefore may dominate in scenarios where spin-independent WIMP-nucleon interactions are suppressed. Moreover, for natural values of the couplings, they dominate over the spin-dependent channel due to their coherence in the nucleus. Using the signal model of this new WIMP-pion channel, no significant excess is found, leading to an upper limit cross section of 6.4 x 10(-46) cm(2) (90% confidence level) at 30 GeV/c(2) WIMP mass.

  • 3. Aprile, E.
    et al.
    Aalbers, Jelle
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). Nikhef and the University of Amsterdam, Netherlands.
    Agostini, F.
    Alfonsi, M.
    Althueser, L.
    Amaro, F. D.
    Anthony, M.
    Antochi, Vasile Cristian
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Arneodo, F.
    Baudis, L.
    Bauermeister, Boris
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Benabderrahmane, M. L.
    Berger, T.
    Breur, P. A.
    Brown, A.
    Brown, A.
    Brown, E.
    Bruenner, S.
    Bruno, G.
    Budnik, R.
    Capelli, C.
    Cardoso, J. M. R.
    Cichon, D.
    Coderre, D.
    Colijn, A. P.
    Conrad, Jan
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Cussormeau, J. P.
    Decowski, M. P.
    de Perio, P.
    Di Gangi, P.
    Di Giovanni, A.
    Diglio, S.
    Elykov, A.
    Eurin, G.
    Fei, J.
    Ferella, Alfredo D.
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Fieguth, A.
    Fulgione, W.
    Gallo Rosso, A.
    Galloway, M.
    Gao, F.
    Garbini, M.
    Grandi, L.
    Greene, Z.
    Hasterok, C.
    Hogenbirk, E.
    Howlett, J.
    Iacovacci, M.
    Itay, R.
    Joerg, F.
    Kazamna, S.
    Kish, A.
    Koltman, G.
    Kopec, A.
    Landsman, H.
    Lang, R. F.
    Levinson, L.
    Lin, Q.
    Lindemann, S.
    Lindner, M.
    Lombardi, F.
    Lopes, J. A. M.
    Fune, E. Lopez
    Macolino, C.
    Mahlstedt, Jörn
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Manfredini, A.
    Marignetti, F.
    Undagoitia, T. Marrodan
    Masbou, J.
    Masson, D.
    Mastroianni, S.
    Messina, M.
    Micheneau, K.
    Miller, K.
    Molinario, A.
    Morå, Knut
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Mosbacher, Y.
    Murra, M.
    Naganoma, J.
    Ni, K.
    Oberlack, U.
    Odgers, K.
    Pelssers, Bart
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Piastra, F.
    Pienaar, J.
    Pizzella, V
    Plante, G.
    Podviianiuk, R.
    Prie, N.
    Qiu, H.
    Garcia, D. Ramirez
    Reichard, S.
    Riedel, B.
    Rizzo, A.
    Rocchetti, A.
    Rupp, N.
    dos Santos, J. M. F.
    Sartorelli, G.
    Sarcevic, N.
    Scheibelhut, M.
    Schindler, S.
    Schreiner, J.
    Schulte, D.
    Schumann, M.
    Lavina, L. Scotto
    Selvi, M.
    Shagin, P.
    Shockley, E.
    Silva, M.
    Simgen, H.
    Therreau, C.
    Thers, D.
    Toschi, F.
    Trinchero, G.
    Tunnell, C.
    Upole, N.
    Vargas, M.
    Wack, O.
    Wang, H.
    Wang, Z.
    Wei, Y.
    Weinheimer, C.
    Wenz, D.
    Wittweg, C.
    Wulf, J.
    Xu, Z.
    Ye, J.
    Zhang, Y.
    Zhu, T.
    Zopounidis, J. P.
    Constraining the Spin-Dependent WIMP-Nucleon Cross Sections with XENON1T2019In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 122, no 14, article id 141301Article in journal (Refereed)
    Abstract [en]

    We report the first experimental results on spin-dependent elastic weakly interacting massive particle (WIMP) nucleon scattering from the XENON1T dark matter search experiment. The analysis uses the full ton year exposure of XENON1T to constrain the spin-dependent proton-only and neutron-only cases. No significant signal excess is observed, and a profile likelihood ratio analysis is used to set exclusion limits on the WIMP-nucleon interactions. This includes the most stringent constraint to date on the WIMP-neutron cross section, with a minimum of 6.3 x 10(-42) cm(2) at 30 GeV/c(2) and 90% confidence level. The results are compared with those from collider searches and used to exclude new parameter space in an isoscalar theory with an axial-vector mediator.

  • 4. Aprile, E.
    et al.
    Aalbers, Jelle
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). Nikhef and the University of Amsterdam, Netherlands.
    Agostini, F.
    Alfonsi, M.
    Althueser, L.
    Amaro, F. D.
    Antochi, Vasile Cristian
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Arneodo, F.
    Barge, Derek
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Baudis, L.
    Bauermeister, Boris
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Bellagamba, L.
    Benabderrahmane, M. L.
    Berger, T.
    Breur, P. A.
    Brown, A.
    Brown, E.
    Bruenner, S.
    Bruno, G.
    Budnik, R.
    Buetikofer, L.
    Capelli, C.
    Cardoso, J. M. R.
    Cichon, D.
    Coderre, D.
    Colijn, A. P.
    Conrad, Jan
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Cussonneau, J. P.
    Decowski, M. P.
    de Perio, P.
    Di Gangi, P.
    Di Giovanni, A.
    Diglio, S.
    Elykov, A.
    Eurin, G.
    Fei, J.
    Ferella, Alfredo D.
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Fieguth, A.
    Fulgione, W.
    Gaemers, P.
    Rosso, A. Gallo
    Galloway, M.
    Gao, F.
    Garbini, M.
    Grandi, L.
    Greene, Z.
    Hasterok, C.
    Hogenbirk, E.
    Howlett, J.
    Iacovacci, M.
    Itay, R.
    Joerg, F.
    Kazama, S.
    Kish, A.
    Kobayashi, M.
    Koltman, G.
    Kopec, A.
    Landsman, H.
    Lang, R. F.
    Levinson, L.
    Lin, Q.
    Lindemann, S.
    Lindner, M.
    Lombardi, F.
    Lopes, J. A. M.
    Fune, E. Lopez
    Macolino, C.
    Mahlstedt, Jörn
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Manfredini, A.
    Marignetti, F.
    Undagoitia, T. Marrodan
    Masbou, J.
    Masson, D.
    Mastroianni, S.
    Messina, M.
    Micheneau, K.
    Miller, K.
    Molinario, A.
    Morå, Knut
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Mosbacher, Y.
    Murra, M.
    Naganoma, J.
    Ni, K.
    Oberlack, U.
    Odgers, K.
    Pelssers, Bart
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Peres, R.
    Piastra, F.
    Pienaar, J.
    Pizzella, V
    Plante, G.
    Podviianiuk, R.
    Qiu, H.
    Garcia, D. Ramirez
    Reichard, M. S.
    Riedel, B.
    Rocchetti, A.
    Rupp, N.
    dos Santos, J. M. F.
    Sartorelli, G.
    Sarcevic, N.
    Scheibelhut, M.
    Schindler, S.
    Schreiner, J.
    Schulte, D.
    Schumann, M.
    Lavina, L. Scotto
    Selvi, M.
    Shagin, P.
    Shockley, E.
    Silva, M.
    Simgen, H.
    Therreau, C.
    Thers, D.
    Toschi, F.
    Trinchero, G.
    Tunnell, C. D.
    Upole, N.
    Vargas, M.
    Volta, G.
    Wack, O.
    Wang, H.
    Wei, Y.
    Weinheimer, C.
    Wenz, D.
    Wittweg, C.
    Wulf, J.
    Ye, J.
    Zhang, Y.
    Zhu, T.
    Zopounidis, J. P.
    Pieracci, M.
    Tintori, C.
    The XENON1T data acquisition system2019In: Journal of Instrumentation, ISSN 1748-0221, E-ISSN 1748-0221, Vol. 14, article id P07016Article in journal (Refereed)
    Abstract [en]

    The XENON1T liquid xenon time projection chamber is the most sensitive detector built to date for the measurement of direct interactions of weakly interacting massive particles with normal matter. The data acquisition system (DAQ) is constructed from commercial, open source, and custom components to digitize signals from the detector and store them for later analysis. The system achieves an extremely low signal threshold by triggering each channel independently, achieving a single photoelectron acceptance of (93 +/- 3)%, and deferring the global trigger to a later, software stage. The event identification is based on MongoDB database queries and has over 98% efficiency at recognizing interactions at the analysis threshold in the center of the target. A readout bandwidth over 300 MB/s is reached in calibration modes and is further expandable via parallelization. This DAQ system was successfully used during three years of operation of XENON1T.

  • 5. Aprile, E.
    et al.
    Aalbers, Jelle
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). Nikhef and the University of Amsterdam, Netherlands.
    Agostini, F.
    Alfonsi, M.
    Althueser, L.
    Amaro, F. D.
    Antochi, Vasile Cristian
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Arneodo, F.
    Baudis, L.
    Bauermeister, Boris
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Bellagamba, L.
    Benabderrahmane, M. L.
    Berger, T.
    Breur, P. A.
    Brown, A.
    Brown, E.
    Bruenner, S.
    Bruno, G.
    Budnik, R.
    Capelli, C.
    Cardoso, J. M. R.
    Cichon, D.
    Coderre, D.
    Colijn, A. P.
    Conrad, Jan
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Cussonneau, J. P.
    Decowski, M. P.
    de Perio, P.
    Di Gangi, P.
    Di Giovanni, A.
    Diglio, S.
    Elykov, A.
    Eurin, G.
    Fei, J.
    Ferella, Alfredo D.
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Fieguth, A.
    Fulgione, W.
    Rosso, A. Gallo
    Galloway, M.
    Gao, F.
    Garbini, M.
    Grandi, L.
    Greene, Z.
    Hasterok, C.
    Hogenbirk, E.
    Howlett, J.
    Iacovacci, M.
    Itay, R.
    Joerg, F.
    Kazama, S.
    Kish, A.
    Koltman, G.
    Kopec, A.
    Landsman, H.
    Lang, R. F.
    Levinson, L.
    Lin, Q.
    Lindemann, S.
    Lindner, M.
    Lombardi, F.
    Lopes, J. A. M.
    Fune, E. Lopez
    Macolino, C.
    Mahlstedt, Jörn
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Manfredini, A.
    Marignetti, F.
    Undagoitia, T. Marrodan
    Masbou, J.
    Masson, D.
    Mastroianni, S.
    Messina, M.
    Micheneau, K.
    Miller, K.
    Molinario, A.
    Morå, Knut
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Mosbacher, Y.
    Murra, M.
    Naganoma, J.
    Ni, K.
    Oberlack, U.
    Odgers, K.
    Pelssers, Bart
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Peres, R.
    Piastra, F.
    Pienaar, J.
    Pizzella, V
    Plante, G.
    Podviianiuk, R.
    Qiu, H.
    Garcia, D. Ramirez
    Reichard, S.
    Riedel, B.
    Rizzo, A.
    Rocchetti, A.
    Rupp, N.
    dos Santos, J. M. F.
    Sartorelli, G.
    Sarcevic, N.
    Scheibelhut, M.
    Schindler, S.
    Schreiner, J.
    Schulte, D.
    Schumann, M.
    Lavina, L. Scotto
    Selvi, M.
    Shagin, P.
    Shockley, E.
    Silva, M.
    Simgen, H.
    Therreau, C.
    Thers, D.
    Toschi, F.
    Trinchero, G.
    Tunnell, C.
    Upole, N.
    Vargas, M.
    Wack, O.
    Wang, H.
    Wang, Z.
    Wei, Y.
    Weinheimer, C.
    Wenz, D.
    Wittweg, C.
    Wulf, J.
    Ye, J.
    Zhang, Y.
    Zhu, T.
    Zopounidis, J. P.
    XENON1T dark matter data analysis: Signal reconstruction, calibration, and event selection2019In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 100, no 5, article id 052014Article in journal (Refereed)
    Abstract [en]

    The XENON1T experiment at the Laboratori Nazionali del Gran Sasso is the most sensitive direct detection experiment for dark matter in the form of weakly interacting particles (WIMPs) with masses above 6 GeV/c(2) scattering off nuclei. The detector employs a dual-phase time projection chamber with 2.0 metric tons of liquid xenon in the target. A one metric ton x year exposure of science data was collected between October 2016 and February 2018. This article reports on the performance of the detector during this period and describes details of the data analysis that led to the most stringent exclusion limits on various WIMP-nucleon interaction models to date. In particular, signal reconstruction, event selection, and calibration of the detector response to nuclear and electronic recoils in XENON1T are discussed.

  • 6. Aprile, E.
    et al.
    Aalbers, Jelle
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). Nikhef and the University of Amsterdam, Netherlands.
    Agostini, F.
    Alfonsi, M.
    Althueser, L.
    Amaro, F. D.
    Antochi, Vasile Cristian
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Arneodo, F.
    Baudis, L.
    Bauermeister, Boris
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Benabderrahmane, M. L.
    Berger, T.
    Breur, P. A.
    Brown, A.
    Brown, E.
    Bruenner, S.
    Bruno, G.
    Budnik, R.
    Capelli, C.
    Cardoso, J. M. R.
    Cichon, D.
    Coderre, D.
    Colijn, A. P.
    Conrad, Jan
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Cussonneau, J. P.
    Decowski, M. P.
    de Perio, P.
    Di Gangi, P.
    Di Giovanni, A.
    Diglio, S.
    Elykov, A.
    Eurin, G.
    Fei, J.
    Ferella, Alfredo D.
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Fieguth, A.
    Fulgione, W.
    Rosso, A. Gallo
    Galloway, M.
    Gao, F.
    Garbini, M.
    Grandi, L.
    Greene, Z.
    Hasterok, C.
    Hogenbirk, E.
    Howlett, J.
    Iacovacci, M.
    Itay, R.
    Joerg, F.
    Kazama, S.
    Kish, A.
    Koltman, G.
    Kopec, A.
    Landsman, H.
    Lang, R. F.
    Levinson, L.
    Lin, Q.
    Lindemann, S.
    Lindner, M.
    Lombardi, F.
    Lopes, J. A. M.
    Fune, E. Lopez
    Macolino, C.
    Mahlstedt, Jörn
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Manfredini, A.
    Marignetti, F.
    Undagoitia, T. Marrodan
    Masbou, J.
    Masson, D.
    Mastroianni, S.
    Messina, M.
    Micheneau, K.
    Miller, K.
    Molinario, A.
    Morå, Knut
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Mosbacher, Y.
    Murra, M.
    Naganoma, J.
    Ni, K.
    Oberlack, U.
    Odgers, K.
    Pelssers, Bart
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Peres, R.
    Piastra, F.
    Pienaar, J.
    Pizzella, V
    Plante, G.
    Podviianiuk, R.
    Qiu, H.
    Garcia, D. Ramirez
    Reichard, S.
    Riedel, B.
    Rizzo, A.
    Rocchetti, A.
    Rupp, N.
    dos Santos, J. M. F.
    Sartorelli, G.
    Sarcevic, N.
    Scheibelhut, M.
    Schindler, S.
    Schreiner, J.
    Schulte, D.
    Schumann, M.
    Lavina, L. Scotto
    Selvi, M.
    Shagin, P.
    Shockley, E.
    Silva, M.
    Simgen, H.
    Therreau, C.
    Thers, D.
    Toschi, F.
    Trinchero, G.
    Tunnell, C.
    Upole, N.
    Vargas, M.
    Wack, O.
    Wang, H.
    Wang, Z.
    Wei, Y.
    Weinheimer, C.
    Wenz, D.
    Wittweg, C.
    Wulf, J.
    Ye, J.
    Zhang, Y.
    Zhu, T.
    Zopounidis, J. P.
    XENON1T dark matter data analysis: Signal and background models and statistical inference2019In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 99, no 11, article id 112009Article in journal (Refereed)
    Abstract [en]

    The XENON1T experiment searches for dark matter particles through their scattering off xenon atoms in a 2 metric ton liquid xenon target. The detector is a dual-phase time projection chamber, which measures simultaneously the scintillation and ionization signals produced by interactions in target volume, to reconstruct energy and position, as well as the type of the interaction. The background rate in the central volume of XENON1T detector is the lowest achieved so far with a liquid xenon-based direct detection experiment. In this work we describe the response model of the detector, the background and signal models, and the statistical inference procedures used in the dark matter searches with a 1 metric ton x year exposure of XENON1T data, that leads to the best limit to date on WIMP-nucleon spin-independent elastic scatter cross section for WIMP masses above 6 GeV/c(2).

  • 7. Aprile, Elena
    et al.
    Aalbers, Jelle
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Antochi, Vasile Cristian
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Bauermeister, Boris
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Conrad, Jan
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Ferella, Alfredo Davide
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Mahlstedt, Jörn
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Morå, Knut
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Pelssers, Bart
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Zopounidis, J. P.
    Analysis of the XENON1T data for WIMP search: Background Models and Statistical InferenceManuscript (preprint) (Other academic)
    Abstract [en]

    The XENON1T experiment searches for dark matter recoils within a $2$ tonne liquid xenon target. The detector is operated as a dual-phase time projection chamber, and reconstructs the energy and position of interactions in the active volume. In the central volume of the target mass, the lowest background rate of a xenon-based direct detection experiment so far has been achieved. In this work we describe the detector response modelling, the background and signal models, and the statistical inference procedures used in a search for Weakly Interacting Massive Particles (WIMPs) using 1\,tonne$\times$year exposure of XENON1T data.

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