Electroweak Bremsstrahlung in Dark Matter Annihilation

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dc.creatorBell, Nicole F.
dc.creatorDent, James B.
dc.creatorJacques, Thomas D.
dc.creatorWeiler, Thomas J.
dc.date2008-05-22
dc.date2008-12-22
dc.date.accessioned2026-07-07T12:20:44Z
dc.date.available2026-07-07T12:20:44Z
dc.descriptionA conservative upper bound on the total dark matter (DM) annihilation rate can be obtained by constraining the appearance rate of the annihilation products which are hardest to detect. The production of neutrinos, via the process $χχ\to \barνν$, has thus been used to set a strong general bound on the dark matter annihilation rate. However, Standard Model radiative corrections to this process will inevitably produce photons which may be easier to detect. We present an explicit calculation of the branching ratios for the electroweak bremsstrahlung processes $χχ\to \barννZ$ and $χχ\to \barνe W$. These modes inevitably lead to electromagnetic showers and further constraints on the DM annihilation cross-section. In addition to annihilation, our calculations are also applicable to the case of dark matter decay.
dc.description7 pages, 4 figures. New appendix with an extensive discussion of Majorana fermions and helicity suppressions
dc.identifierhttps://arxiv.org/abs/0805.3423
dc.identifierhttp://arxiv.org/abs/0805.3423
dc.identifierPhys.Rev.D78:083540,2008
dc.identifierdoi:10.1103/PhysRevD.78.083540
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/213151
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectAstrophysics
dc.titleElectroweak Bremsstrahlung in Dark Matter Annihilation
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