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Title: Wino dark matter under siege

A fermion triplet of SU(2){sub L} — a wino — is a well-motivated dark matter candidate. This work shows that present-day wino annihilations are constrained by indirect detection experiments, with the strongest limits coming from H.E.S.S. and Fermi. The bounds on wino dark matter are presented as a function of mass for two scenarios: thermal (winos constitute a subdominant component of the dark matter for masses less than 3.1 TeV) and non-thermal (winos comprise all the dark matter). Assuming the NFW halo model, the H.E.S.S. search for gamma-ray lines excludes the 3.1 TeV thermal wino; the combined H.E.S.S. and Fermi results completely exclude the non-thermal scenario. Uncertainties in the exclusions are explored. Indirect detection may provide the only probe for models of anomaly plus gravity mediation where the wino is the lightest superpartner and scalars reside at the 100 TeV scale.
Authors:
 [1] ;  [2] ;  [3] ;  [4]
  1. Theory Group, SLAC National Accelerator Laboratory, Menlo Park, CA, 94025 (United States)
  2. Princeton Center for Theoretical Science, Princeton University, Princeton, NJ, 08544 (United States)
  3. Michigan Center for Theoretical Physics, Department of Physics, Ann Arbor, MI, 48109 (United States)
  4. School of Natural Sciences, Institute for Advanced Study, Princeton, NJ, 08540 (United States)
Publication Date:
OSTI Identifier:
22369957
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2013; Journal Issue: 10; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ANNIHILATION; FERMIONS; GAMMA RADIATION; GRAVITATION; NEGOTIATION; NONLUMINOUS MATTER; PROBES; SCALARS; TEV RANGE 01-10; WINOS