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.
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页数：5
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