Electroweak bremsstrahlung in dark matter annihilation

被引：57

作者：

Bell, Nicole F. ^{[1
]}

Dent, James B. ^{[2
]}

Jacques, Thomas D. ^{[1
]}

Weiler, Thomas J. ^{[2
]}

机构：

[1] Univ Melbourne, Sch Phys, Melbourne, Vic 3010, Australia

[2] Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA

来源：

PHYSICAL REVIEW D | 2008年 / 78卷 / 08期

关键词：

D O I：

10.1103/PhysRevD.78.083540

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A conservative upper bound on the total dark matter 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 chi chi ->(nu)overbar nu, 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 chi chi ->(nu)nu Z and chi chi ->(nu)eW. These modes inevitably lead to electromagnetic showers and further constraints on the dark matter annihilation cross section. In addition to annihilation, our calculations are also applicable to the case of dark matter decay.

引用

页数：7

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