Extended MSSM Neutralinos as the Source of the PAMELA Positron Excess

Preprint

1 June 2009

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.0906.0362

Abstract

We consider a scenario within the Minimal Supersymmetric Standard Model extended by a singlet chiral superfield, in which neutralino dark matter annihilates to light singlet-like 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 singlet-like scalar Higgs can induce a large Sommerfeld enhancement and provide an annihilation rate sufficient to accommodate the observed positron excess.

Keywords

POSITRON EXCESS
STANDARD MODEL
ANNIHILATION
SINGLET LIKE
DARK MATTER
NEUTRALINO
PAMELA
HIGGS
MSSM

All Related Versions

Version 1, 2009-06-01, ArXiv
Published version: Physical Review D, 80 (5).

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