Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-09-14
Phys.Rev.D83:013001,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
19 pages, 5 figures. Updated to include Erratum, and changes made to PRD version
Scientific paper
10.1103/PhysRevD.83.013001
Dark matter annihilation to leptons, $\chi \chi \rightarrow l \bar{l}$, is necessarily accompanied by electroweak radiative corrections, in which a W or Z boson is radiated from a final state particle. Given that the W and Z gauge bosons decay dominantly via hadronic channels, it is thus impossible to produce final state leptons without accompanying protons, antiprotons, and gamma rays. Significantly, while many dark matter models feature a helicity suppressed annihilation rate to fermions, radiating a massive gauge boson from a final state fermion removes this helicity suppression, such that the branching ratios Br(l \nu W), Br(l^+l^- Z), and Br(\nu\nubar Z) dominate over Br(l\bar{l}). W/Z-bremsstrahlung thus allows indirect detection of many WIMP models that would otherwise be helicity-suppressed, or v^2 suppressed. Antiprotons and even anti-deuterons become consequential final state particles. This is an important result for future DM searches. We discuss the implications of W/Z-bremsstrahlung for "leptonic" DM models which aim to fit recent cosmic ray positron and antiproton data.
Bell Nicole F.
Dent James B.
Jacques Thomas D.
Weiler Thomas J.
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