Neutralinos in an extension of the minimal supersymmetric standard model as the source of the PAMELA positron excess
- 24 September 2009
- journal article
- Published by American Physical Society (APS) in Physical Review D
- Vol. 80 (5)
- https://doi.org/10.1103/physrevd.80.055028
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 excessKeywords
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