Combined Dark Matter searches towards dwarf spheroidal galaxies with Fermi-LAT, HAWC, HESS, MAGIC and VERITAS

Journal Article · Fri Aug 30 00:00:00 EDT 2019 · PoS - Proceedings of Science

DOI:https://doi.org/10.22323/1.358.0012· OSTI ID:1804379

Oakes, Louise ^[1]; Armand, Celine ^[2]; Charles, Eric ^[3]; di Mauro, Mattia ^[3]; Giuri, Chiara ^[4]; Harding, James Patrick  ^[5]; Kerszberg, Daniel ^[6]; Miener, Tjark ^[7]; Moulin, Emmanuel ^[8]; Poireau, Vincent ^[9]; Pueschel, Elisa ^[10]; Rico, Javier ^[6]; Rinchiuso, Lucia ^[8]; Salazar-Gallegos, Daniel ^[11]; Tollefson, Kirsten ^[11]; Zitzer, Benjamin ^[12]

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1. Humboldt Univ. of Berlin (Germany)
2. Centre National de la Recherche Scientifique (CNRS), LAPP, LAPTh, Annecy-le-Vieux (France)
3. SLAC National Accelerator Lab., Menlo Park, CA (United States)
4. Deutsches Elektronen-Synchrotron (DESY), Zeuthen (Germany)
5. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
6. Institute for High Energy Physics (IFAE)-Barcelona Institute of Science and Technology (BIST), Barcelona (Spain)
7. Univ. Complutense Madrid (Spain). Institute of Particle and Cosmos Physics (IPARCOS)
8. Alternative Energies and Atomic Energy Commission (CEA), Saclay (France)
9. Laboratoire d’Annecy de Physique des Particules (LAPP), Annecy (France)
10. Deutsches Elektronen-Synchrotron (DESY), Zeuthen (Germany)
11. Michigan State Univ., East Lansing, MI (United States)
12. McGill Univ., Montreal, QC (Canada)

The search for Dark Matter (DM) has great potential to reveal physics beyond the Standard Model. As such, searches for evidence of DM particles are being carried out using a wide range of techniques, such as direct searches for DM particles, searches for DM produced with colliders, and indirect searches for the Standard Model annihilation products of DM. Dwarf spheroidal galaxies (dSphs) are excellent targets for indirect Dark Matter searches due to their relatively high DM content and negligible expected astrophysical background. A collaboration was formed to maximise the sensitivity of DM searches towards dSphs by combining for the first time dSph data from three imaging air Cherenkov telescope (IACT) arrays: HESS, MAGIC, and VERITAS; the Fermi-LAT satellite, and the water Cherenkov detector HAWC. Due to the diverse nature of the instruments involved, each experiment will analyse their individual datasets from multiple targets and then the results will be combined at the likelihood level. For consistency of the likelihoods across the five experiments, a common approach is used to treat the astrophysical factor (J-Factor) for each target and an agreed set of annihilation channels are considered. We also agree on a com- mon statistical approach and treatment of instrumental systematic uncertainties. The results are presented in terms of constraints on the velocity-weighted cross section for DM self-annihilation as a function of the DM particle mass.

• Research Organization: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: USDOE Office of Science (SC). High Energy Physics (HEP)
• Contributing Organization: Fermi-LAT Collaboration; HAWC Collaboration; H.E.S.S. Collaboration; MAGIC Collaboration; Veritas Collaboration
• Grant/Contract Number: 89233218CNA000001
• OSTI ID: 1804379
• Report Number(s): LA-UR-21-22663; TRN: US2212280
• Journal Information: PoS - Proceedings of Science, Vol. 358; Conference: 36. International Cosmic Ray Conference , Madison, WI (United States), 24 Jul - 1 Aug 2019; ISSN 1824-8039
• Publisher: SISSA
• Country of Publication: United States
• Language: English

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