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

Journal Article · Tue Sep 01 04:00:00 EDT 2009 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.80.055028· OSTI ID:21322642

Hooper, Dan ^[1]; Tait, Tim M. P. ^[2]

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1. Center for Particle Astrophysics, Fermi National Accelerator Laboratory, Batavia, Illinois 60510-0500 (United States)
2. Department of Physics and Astronomy, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208 (United States)

We consider a scenario within the minimal supersymmetric standard model (MSSM) extended by a singlet chiral superfield, in which neutralino dark matter annihilates to light singletlike 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 singletlike Higgs bosons can induce a large Sommerfeld enhancement and provide an annihilation rate sufficient to accommodate the observed positron excess.

• OSTI ID: 21322642
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 5 Vol. 80; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANNIHILATION
CHIRALITY
COSMIC POSITRONS
COSMIC RADIATION
ELECTRON-POSITRON INTERACTIONS
ELECTRONS
HIGGS BOSONS
MUONS
MUONS PLUS
NONLUMINOUS MATTER
PARTICLE DECAY
POSITRONS
STANDARD MODEL
SUPERSYMMETRY