Extended MSSM Neutralinos as the Source of the PAMELA Positron Excess

Details Extended MSSM Neutralinos as the Source of the PAMELA Positron Excess Extended MSSM Neutralinos as the Source of the PAMELA Positron Excess

2009-06-01

arxiv.org/abs/0906.0362v1

Phys.Rev.D80:055028,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

Scientific paper

10.1103/PhysRevD.80.055028

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.

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