'Exotic vector-like pair' of color-triplet scalars

Abstract

We propose a minimal extension of Standard Model, generating a Majorana mass for neutron, connected with a mechanism of Post-Sphaleron Baryogenesis. We consider an `exotic vector-like pair' of color-triplet scalars, an extra Majorana fermion $ψ$, and a scalar field $ϕ$, giving mass to $ψ$. The vector-like pair is defined `exotic' because of a peculiar mass term of the color-triplet scalars, violating Baryon number as $ΔB=1$. A Post-Sphaleron Baryogenesis is realized through $ϕ$-decays into six quarks (antiquarks), or through $ψ$-decays into three quarks (antiquarks). This model suggests some intriguing B-violating signatures, testable in the next future, in Neutron-Antineutron physics and LHC. We also discuss limits from FCNC. Sterile fermion can also be light as $1-100\, \rm GeV$. In this case, the sterile fermion could be (meta)-stable and $n-\bar{n}$ oscillation can be indirectly generated by two $n-ψ$, $ψ-\bar{n}$ oscillations, without needing of an effective Majorana mass for neutron. Majorana fermion $ψ$ can be a good candidate for WIMP-like dark matter.