Unified TeV Scale Picture of Baryogenesis and Dark Matter

Abstract

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 ∼ 100 GeV and M X ∼ TeV. The scalar partner of N (denotedÑ 1 ) is naturally the lightest SUSY particle as it has no gauge interactions and plays the role of dark matter.Ñ 1 annihilates into quarks efficiently in the early universe via the exchange of the fermionicX 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. ‡

Natural GeV dark matter and the baryon-dark matter coincidence puzzle

“…This leads to the possibility of multi-component DM consisting of N and χ. The LSP component of DM, which can be the Higgsino or the superpartner of N [27], may be detected via direct searches even if it is subdominant. Such a multi-component DM scenario may also yield a detectable signal for indirect experiments.…”

Colored resonant signals at the LHC: largest rate and simplest topology

“…Color-triplet scalars at the TeV scale have also been considered in SUSY models to present a unified explanation of dark matter and baryogenesis [41]. The color-sextet scalars posses similar nature of "diquark Higgs" in some unified theories [3][4][5] or some exotic diquarks [42].…”

Un-oriented quiver theories for Majorana neutrons

“…However, in order to prevent fast proton decay, Lepton number is not to be violated. An alternative is to consider SO(10) GUT models or Pati-Salam like models in string theory that can lead to ∆B = 2 processes but no ∆B = 1 [88][89][90][91][92][93]. Although perturbative un-oriented strings do not admit spinor representations of orthogonal groups, P-S like models are easy to embed in this context [95].…”