Tev Scale Colored Particles, Baryogenesis and Dark Matter

Abstract

We propose a unified scenario of two puzzles in particle physics and cosmology, namely, the dark matter and the origin of the baryon asymmetry of the universe in a simple extension of MSSM. Our model uses a gauge singlet chiral superfield field N, where the out–of equilibrium decay of the fermionic partner of N mediated by the exchange of a colored TeV scale scalar field generates adequate baryon asymmetry for MN∼100 GeV. The scalar partner of N 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 1010 sec, (ii) discovery of colored particles X at LHC with mass of order TeV, and (iii) direct dark matter detection with a predicted cross section in the observable range in next generation dark matter search experiments.