Neutralinos in an extension of the minimal supersymmetric standard model as the source of the PAMELA positron excess

被引：36

作者：

Hooper, Dan ^{[1
,2
]}

Tait, Tim M. P. ^{[3
,4
]}

机构：

[1] Fermilab Natl Accelerator Lab, Ctr Particle Astrophys, Batavia, IL 60510 USA

[2] Univ Chicago, Dept Astron & Astrophys, Chicago, IL 60637 USA

[3] Northwestern Univ, Dept Phys & Astron, Evanston, IL 60208 USA

[4] Argonne Natl Lab, HEP Div, Argonne, IL 60439 USA

来源：

PHYSICAL REVIEW D | 2009年 / 80卷 / 05期

关键词：

PHASE-TRANSITION; HIGGS;

D O I：

10.1103/PhysRevD.80.055028

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We consider a scenario within the minimal supersymmetric standard model (MSSM) extended by a singlet chiral superfield, in which neutralino dark matter annihilates to light singletlike Higgs bosons, which proceed to decay to either electron-positron or muon-antimuon pairs. Unlike neutralino annihilations in the MSSM, this model can provide a good fit to the PAMELA cosmic ray positron fraction excess. Furthermore, the singletlike Higgs bosons can induce a large Sommerfeld enhancement and provide an annihilation rate sufficient to accommodate the observed positron excess.

引用

页数：5

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