Neutralinos in an extension of the minimal supersymmetric standard model as the source of the PAMELA positron excess
Abstract
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.
- Publication:
-
Physical Review D
- Pub Date:
- September 2009
- DOI:
- 10.1103/PhysRevD.80.055028
- arXiv:
- arXiv:0906.0362
- Bibcode:
- 2009PhRvD..80e5028H
- Keywords:
-
- Supersymmetric models;
- Supersymmetric partners of known particles;
- Dark matter;
- Neutrino;
- muon;
- pion;
- and other elementary particles;
- cosmic rays;
- 12.60.Jv;
- 14.80.Ly;
- 95.35.+d;
- 95.85.Ry;
- Supersymmetric models;
- Supersymmetric partners of known particles;
- Dark matter;
- Neutrino muon pion and other elementary particles;
- cosmic rays;
- High Energy Physics - Phenomenology;
- Astrophysics - High Energy Astrophysical Phenomena;
- High Energy Physics - Experiment
- E-Print:
- Phys.Rev.D80:055028,2009