'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 $\psi$, and a scalar field $\varphi$, giving mass to $\psi$. The vector-like pair is defined `exotic' because of a peculiar mass term of the color-triplet scalars, violating Baryon number as $\Delta B=1$. A Post-Sphaleron Baryogenesis is realized through $\varphi$-decays into six quarks (antiquarks), or through $\psi$-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 $1-100\mathrm{GeV}$. In this case, the sterile fermion could be (meta)-stable and $n-\bar{n}$ oscillation can be indirectly generated by two $n-\psi$, $\psi -\bar{n}$ oscillations, without needing of an effective Majorana mass for neutron. Majorana fermion $\psi$ can be a good candidate for WIMP-like dark matter.

arXiv commentSections 2.1 and 3 revisited; New Fig.5 of jj+Missing Energy channel; more references about LHC and FCNCs. Essential results on Neutron-Antineutron oscillations and Post-Sphaleron Baryogenesis are the same. More comments about string-inspred models. Accepted by JHEP

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• Exotic see-saw mechanism for neutrinos and leptogenesis in a Pati-Salam model
• Un-oriented Quiver Theories for Majorana Neutrons
• The fate of Schwarzschild-de Sitter Black Holes in $f(R)$ gravity
• Dark Matter and Inflation in $R+\zeta R^2$ Supergravity
• Nonlocal quantum field theory without acausality and nonunitarity at quantum level: is SUSY the key?
• Way-out to the Gravitino problem in intersecting D-brane Pati-Salam models
• Unitarization and Causalization of Non-local quantum field theories by Classicalization
• Limiting Majoron self-interactions from Gravitational waves experiments
• Dark Matter from Starobinsky Supergravity
• More about Neutron Majorana mass from Exotic Instantons: an alternative mechanism in Low-Scale String theory
• More about the Instanton/Soliton/Kink correspondence
• Neutron-neutral particle mixing and its observable consequences
• Super-light baryphotons, Weak Gravity Conjecture and Exotic instantons in Neutron-Antineutron transitions
• Weak Gravity Conjecture as a Razor Criterium for Exotic D-brane instantons
• Dineutron decay into sterile anti-neutrinos in neutron stars and its observable consequences
• A Scotogenic Model as a Prototype for Leptogenesis with One Single Gauge Singlet
• Testing B-violating signatures from Exotic Instantons in future colliders