Positron fraction from dark matter annihilation in the CMSSM

被引：11

作者：

de Boer, W

Sander, C

Horn, M

Kazakov, D

机构：

[1] Univ Karlsruhe, Inst Expt Kernphys, D-76128 Karlsruhe, Germany

[2] Joint Inst Nucl Res, Bogoliubov Lab Theoret Phys, Dubna 141980, Moscow Region, Russia

来源：

NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS | 2002年 / 113卷

关键词：

D O I：

10.1016/S0920-5632(02)01845-5

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

We investigate, if the cosmic ray positron fraction, as reported by the HEAT and AMS collaborations, is compatible with the annihilation of neutralinos in the supergravity inspired Constrained Minimal Supersymmetric Model (CMSSM), thus complementing previous investigations, which did not consider constraints from unification, electroweak symmetry breaking and the present Higgs limits at LEP. We perform a global fit of all SUSY parameters to low energy constraints and find that in the acceptable parameter regions the neutralino annihilation into b (b) over bar quark pairs is the dominant channel and improves the fit to the experimental positron fraction data considerably with respect to a fit with background only. These fits are comparable to the fit for regions of parameter space, where the annihilation into W+W- pairs dominates. However, these latter regions are ruled out mainly by the present Higgs limit of 114 GeV from LEP in combination with b-->X(s)gamma data.

引用

页码：221 / 228

页数：8

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