Small Steps Towards a Grand Unification and the Electron/Positron Excesses in Cosmic-Ray Experiments
We consider a small extension of the standard model by adding two Majorana fermions; those are adjoint representations of the SU(2){sub L} and SU(3){sub c} gauge groups of the standard model. In this extension, the gauge coupling unification at an energy scale higher than 10{sup 15} GeV is realized when the masses of the triplet and the octet fermions are smaller than 10{sup 4} GeV and 10{sup 12} GeV, respectively. We also show that an appropriate symmetry ensures a long lifetime of the neutral component of the triplet fermion whose thermal relic density naturally explains the observed dark matter density. The electron/positron excesses observed in recent cosmic-ray experiments can be also explained by the decay of the triplet fermion.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE; Theoretical Physics
- DOE Contract Number:
- AC02-76SF00515
- OSTI ID:
- 981676
- Report Number(s):
- SLAC-PUB-13689; arXiv:0906.4667; TRN: US1004360
- Journal Information:
- JHEP 0908:086,2009, Vol. 09, Issue 08
- Country of Publication:
- United States
- Language:
- English
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