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  • 151.
    Silverwood, Hamish
    et al.
    Univ Canterbury, Dept Phys & Astron, Christchurch 8140, New Zealand.
    Scott, Pat
    McGill Univ, Dept Phys, Montreal, PQ H2W 2L8, Canada Organization-Enhanced Name(s) McGill University .
    Danninger, Matthias
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Savage, Chris
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). Department of Physics & Astronomy, University of Utah, Salt Lake City.
    Edsjö, Joakim
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Adams, Jenni
    Univ Canterbury, Dept Phys & Astron, Christchurch 8140, New Zealand.
    Brown, Anthony M.
    Univ Canterbury, Dept Phys & Astron, Christchurch 8140, New Zealand.
    Hultqvist, Klas
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Sensitivity of IceCube-DeepCore to Neutralino Dark Matter in the MSSM-252013In: Journal of Cosmology and Astroparticle Physics, ISSN 1475-7516, E-ISSN 1475-7516, Vol. 03, p. 023-Article in journal (Refereed)
    Abstract [en]

    We analyse the sensitivity of IceCube-DeepCore to annihilation of neutralino dark matter in the solar core, generated within a 25 parameter version of the minimally supersymmetric standard model (MSSM-25). We explore the 25-dimensional parameter space using scanning methods based on importance sampling and using DarkSUSY 5.0.6 to calculate observables. Our scans produced a database of 6.02 million parameter space points with neutralino dark matter consistent with the relic density implied by WMAP 7-year data, as well as with accelerator searches. We performed a model exclusion analysis upon these points using the expected capabilities of the IceCube-DeepCore Neutrino Telescope. We show that IceCube-DeepCore will be sensitive to a number of models that are not accessible to direct detection experiments such as SIMPLE, COUPP and XENON100, indirect detection using Fermi-LAT observations of dwarf spheroidal galaxies, nor to current LHC searches.

  • 152.
    Åsman, Barbro
    et al.
    Stockholm University, Faculty of Science, Department of Physics.
    Berntzon, L.
    Stockholm University, Faculty of Science, Department of Physics.
    Dalmau, Jörgen
    Stockholm University, Faculty of Science, Department of Physics.
    Holmgren, Sven-Olof
    Stockholm University, Faculty of Science, Department of Physics.
    Hultqvist, Klas
    Stockholm University, Faculty of Science, Department of Physics.
    Johansson, Erik K.
    Stockholm University, Faculty of Science, Department of Physics.
    Johansson, P. D.
    Stockholm University, Faculty of Science, Department of Physics.
    Leinonen, Lena
    Stockholm University, Faculty of Science, Department of Physics.
    Moa, Torbjörn
    Stockholm University, Faculty of Science, Department of Physics.
    Electroweak measurements in electron positron collisions at W-boson-pair energies at LEP2013In: Physics reports, ISSN 0370-1573, E-ISSN 1873-6270, Vol. 532, no 4, p. 119-244Article, review/survey (Refereed)
    Abstract [en]

    Electroweak measurements performed with data taken at the electron positron collider LEP at CERN from 1995 to 2000 are reported. The combined data set considered in this report corresponds to a total luminosity of about 3 fb(-1) collected by the four LEP experiments ALEPH, DELPHI, 13 and OPAL, at centre-of-mass energies ranging from 130 GeV to 209 GeV. Combining the published results of the four LEP experiments, the measurements include total and differential cross-sections in photon-pair, fermion-pair and four-fermion production, the latter resulting from both double-resonant WW and ZZ production as well as singly resonant production. Total and differential cross-sections are measured precisely, providing a stringent test of the Standard Model at centre-of-mass energies never explored before in electron positron collisions. Final-state interaction effects in four-fermion production, such as those arising from colour reconnection and Bose Einstein correlations between the two W decay systems arising in WW production, are searched for and upper limits on the strength of possible effects are obtained. The data are used to determine fundamental properties of the W boson and the electroweak theory. Among others, the mass and width of the W boson, m(w) and Gamma(w), the branching fraction of W decays to hadrons, B(W -> had), and the trilinear gauge-boson self-couplings g(1)(Z), K-gamma and lambda(gamma), are determined to be: m(w) = 80.376 +/- 0.033 GeV Gamma(w) = 2.195 +/- 0.083 GeV B(W -> had) = 67.41 +/- 0.27% g(1)(Z) = 0.984(-0.020)(+0.018) K-gamma - 0.982 +/- 0.042 lambda(gamma) = 0.022 +/- 0.019.

  • 153.
    Åsman, Barbro
    et al.
    Stockholm University, Faculty of Science, Department of Physics.
    Berntzon, Lisa
    Stockholm University, Faculty of Science, Department of Physics.
    Dalmau, Jörgen
    Stockholm University, Faculty of Science, Department of Physics.
    Holmgren, Sven-Olof
    Stockholm University, Faculty of Science, Department of Physics.
    Hultqvist, Klas
    Stockholm University, Faculty of Science, Department of Physics.
    Johansson, K. Erik
    Stockholm University, Faculty of Science, Department of Physics.
    Johansson, Per
    Stockholm University, Faculty of Science, Department of Physics.
    Leinonen, Lena
    Stockholm University, Faculty of Science, Department of Physics.
    Lipniacka, Anna
    Stockholm University, Faculty of Science, Department of Physics.
    Moa, Torbjörn
    Stockholm University, Faculty of Science, Department of Physics.
    Search for charged Higgs bosons: combined results using LEP data2013In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 73, no 7, article id 2463Article in journal (Refereed)
    Abstract [en]

    The four LEP collaborations, ALEPH, DELPHI, L3 and OPAL, have searched for pair-produced charged Higgs bosons in the framework of Two Higgs Doublet Models (2HDMs). The data of the four experiments have been statistically combined. The results are interpreted within the 2HDM for Type I and Type II benchmark scenarios. No statistically significant excess has been observed when compared to the Standard Model background prediction, and the combined LEP data exclude large regions of the model parameter space. Charged Higgs bosons with mass below 80 GeV/c(2) (Type II scenario) or 72.5 GeV/c(2) (Type I scenario, for pseudo-scalar masses above 12 GeV/c(2)) are excluded at the 95 % confidence level.

1234 151 - 153 of 153
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