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Dark matter constraints from a joint analysis of dwarf Spheroidal galaxy observations with VERITAS

2017; American Physical Society; Volume: 95; Issue: 8 Linguagem: Inglês

10.1103/physrevd.95.082001

2470-0037

S. Archambault, A. Archer, W. Benbow, R. Bird, Etienne Bourbeau, T. Brantseg, M. Buchovecky, J. H. Buckley, V. Bugaev, K. Byrum, M. Cerruti, Jessie L. Christiansen, M. P. Connolly, Wei Cui, M. K. Daniel, Q. Feng, J. P. Finley, Henrike Fleischhack, L. Fortson, A. Furniss, Alex Geringer-Sameth, S. Griffin, J. Grube, Moritz Hütten, N. Håkansson, D. Hanna, O. Hervet, J. Holder, G. Hughes, B. Hummensky, C. A. Johnson, P. Kaaret, P. Kar, N. Kelley-Hoskins, M. Kertzman, D. Kieda, Savvas M. Koushiappas, M. Krause, F. Krennrich, M. J. Lang, T. T. Y. Lin, S. McArthur, P. Moriarty, R. Mukherjee, D. Nieto, S. O’Brien, R. A. Ong, A. N. Otte, N. Park, M. Pohl, A. Popkow, E. Pueschel, J. Quinn, K. Ragan, P. T. Reynolds, G. T. Richards, E. Roache, C. B. Rulten, I. Sadeh, M. Santander, G. H. Sembroski, K. Shahinyan, A. W. Smith, D. Staszak, I. Telezhinsky, Samuel Trépanier, J. V. Tucci, J. Tyler, S. P. Wakely, A. J. Weinstein, P. Wilcox, D. A. Williams, B. Zitzer,

Particle physics theoretical and experimental studies

We present constraints on the annihilation cross section of weakly interacting massive particles dark matter based on the joint statistical analysis of four dwarf galaxies with VERITAS. These results are derived from an optimized photon weighting statistical technique that improves on standard imaging atmospheric Cherenkov telescope (IACT) analyses by utilizing the spectral and spatial properties of individual photon events. We report on the results of $\ensuremath{\sim}230$ hours of observations of five dwarf galaxies and the joint statistical analysis of four of the dwarf galaxies. We find no evidence of gamma-ray emission from any individual dwarf nor in the joint analysis. The derived upper limit on the dark matter annihilation cross section from the joint analysis is $1.35\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}23}\text{ }\text{ }{\mathrm{cm}}^{3}\text{ }{\mathrm{s}}^{\ensuremath{-}1}$ at 1 TeV for the bottom quark ($b\overline{b}$) final state, $2.85\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}24}\text{ }\text{ }{\mathrm{cm}}^{3}\text{ }{\mathrm{s}}^{\ensuremath{-}1}$ at 1 TeV for the tau lepton (${\ensuremath{\tau}}^{+}{\ensuremath{\tau}}^{\ensuremath{-}}$) final state and $1.32\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}25}\text{ }\text{ }{\mathrm{cm}}^{3}\text{ }{\mathrm{s}}^{\ensuremath{-}1}$ at 1 TeV for the gauge boson ($\ensuremath{\gamma}\ensuremath{\gamma}$) final state.