Neutralinos in an extension of the minimal supersymmetric standard model as the source of the PAMELA positron excess

Journal Article · Mon Jun 01 00:00:00 EDT 2009 · Phys.Rev.D

DOI:https://doi.org/10.1103/PhysRevD.80.055028· OSTI ID:3019846

Hooper, Dan ^[1]; Tait, Tim M.P. ^[2]

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1. Fermilab; Chicago U., Astron. Astrophys. Ctr.
2. Northwestern U.; Argonne

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.

• Research Organization: Northwestern U.; Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Argonne National Laboratory (ANL), Argonne, IL (United States); Chicago U., Astron. Astrophys. Ctr.
• Sponsoring Organization: US Department of Energy
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 3019846
• Report Number(s): ANL-HEP-PR-09-36; FERMILAB-PUB-09-258-A; NUHEP-TH-09-07; oai:inspirehep.net:822017; arXiv:0906.0362
• Journal Information: Phys.Rev.D, Journal Name: Phys.Rev.D Vol. 80
• Country of Publication: United States
• Language: English