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High Energy Physics - Phenomenology

arXiv:1308.1426 (hep-ph)
[Submitted on 6 Aug 2013]

Title:Likely Dominance of WIMP Annihilation to Fermion Pair + W/Z

Authors:Thomas J. Weiler (Vanderbilt University)
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Abstract:Arguably, the most popular candidate for Dark Matter (DM) is a massive, stable, Majorana fermion. However, annihilation of Majorana DM to two fermions features a helicity-suppressed s-wave rate. The process radiating a gauge boson via electroweak (EW) and electromagnetic (EM) bremsstrahlung removes this s-wave suppression, and is likely to be the dominant modes of gauge-singlet Majorana DM annihilation. Given their enhanced annihilation rate with radiatedW and Z gauge bosons, and the subsequent dominant W/Z decays via hadronic channels, Majorana DM tends to produce more antiprotons than positrons. This result contrasts with observations, thereby presenting a challenge to model building with Majorana DM.
Comments: Talk presented at ICRC2013, July 2-9, Rio de Janeiro, Brazil; 4 pages, includes two paneled figures and two tables
Subjects: High Energy Physics - Phenomenology (hep-ph); Cosmology and Nongalactic Astrophysics (astro-ph.CO); High Energy Astrophysical Phenomena (astro-ph.HE)
Cite as: arXiv:1308.1426 [hep-ph]
  (or arXiv:1308.1426v1 [hep-ph] for this version)
  https://doi.org/10.48550/arXiv.1308.1426

Submission history

From: Thomas J. Weiler [view email]
[v1] Tue, 6 Aug 2013 21:37:53 UTC (103 KB)
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