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2009

Extended MSSM Neutralinos as the Source of the PAMELA Positron Excess

Hooper, Dan, Tait, Tim M. P.

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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.

Extended MSSM Neutralinos as the Source of the PAMELA Positron Excess · Around

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