Abstract
We present a simple extension of the minimal supersymmetric standard model which provides a unified picture of cosmological baryon asymmetry and dark matter. Our model introduces a gauge singlet field and a color triplet field which couple to the right-handed quark fields. The out-of-equilibrium decay of the Majorana fermion mediated by the exchange of the scalar field generates adequate baryon asymmetry for and . The scalar partner of (denoted ) is naturally the lightest SUSY particle as it has no gauge interactions and plays the role of dark matter. The model is experimentally testable in (i) neutron-antineutron oscillations with a transition time estimated to be around , (ii) discovery of colored particles at LHC with mass of order TeV, and (iii) direct dark matter detection with a predicted cross section in the observable range.
- Received 17 January 2007
DOI:https://doi.org/10.1103/PhysRevLett.98.161301
©2007 American Physical Society