Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-12-28
Phys.Rev.Lett.98:161301,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 pages, one reference updated. Version to appear in Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.98.161301
We present a simple extension of MSSM which provides a unified picture of cosmological baryon asymmetry and dark matter. Our model introduces a gauge singlet field $N$ and a color triplet field $X$ which couple to the right--handed quark fields. The out--of equilibrium decay of the Majorana fermion $N$ mediated by the exchange of the scalar field $X$ generates adequate baryon asymmetry for $M_N \sim 100$ GeV and $M_X \sim$ TeV. The scalar partner of $N$ (denoted $\tilde{N}_1$) is naturally the lightest SUSY particle as it has no gauge interactions and plays the role of dark matter. $\tilde{N}_1$ annihilates into quarks efficiently in the early universe via the exchange of the fermionic $\tilde{X}$ field. The model is experimentally testable in (i) neutron--antineutron oscillations with a transition time estimated to be around $10^{10}$ 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.
Babu K. S.
Mohapatra Rabindra N.
Nasri Salah
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