Role of electroweak bremsstrahlung for indirect dark matter signatures

被引：72

作者：

Kachelriess, M. ^{[1
]}

Serpico, P. D. ^{[2
,3
]}

Solberg, M. Aa. ^{[1
]}

机构：

[1] NTNU, Inst Fys, N-7491 Trondheim, Norway

[2] CERN, Dept Phys, Div Theory, CH-1211 Geneva 23, Switzerland

[3] LAPTH, UMR 5108, F-74941 Annecy Le Vieux, France

来源：

PHYSICAL REVIEW D | 2009年 / 80卷 / 12期

基金：

美国国家科学基金会;

关键词：

RADIATIVE PROCESSES;

D O I：

10.1103/PhysRevD.80.123533

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Interpretations of indirect searches for dark matter (DM) require theoretical predictions for the annihilation or decay rates of DM into stable particles of the standard model. These predictions include usually only final states accessible as lowest order tree-level processes, with electromagnetic bremsstrahlung and the loop-suppressed two gamma-ray line as exceptions. We show that this restriction may lead to severely biased results for DM tailored to produce only leptons in final states and with mass in the TeV range. For such models, unavoidable electroweak bremsstrahlung of Z and W-bosons has a significant influence both on the branching ratio and the spectral shape of the final state particles. We work out the consequences for two situations: First, the idealized case where DM annihilates at tree level with 100% branching ratio into neutrinos. For a given cross section, this leads eventually to "minimal yields" of photons, electrons, positrons, and antiprotons. Second, the case where the only allowed two-body final states are electrons. The latter case is typical of models aimed at fitting cosmic ray e(-) and e(+) data. We find that the multimessenger signatures of such models can be significantly modified with respect to results presented in the literature.

引用

页数：9

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