'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.

Sections 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

References in corpus (11)

• Spacetime Instanton Corrections in 4D String Vacua - The Seesaw Mechanism for D-Brane Models
• Neutrino Majorana Masses from String Theory Instanton Effects
• Neutron -- Mirror Neutron Oscillation: How Fast Might It Be?
• Instanton Induced Neutrino Majorana Masses in CFT Orientifolds with MSSM-like spectra
• Experimental search for neutron - mirror neutron oscillations using storage of ultracold neutrons
• More about neutron - mirror neutron oscillation
• Fast Neutron - Mirror Neutron Oscillation and Ultra High Energy Cosmic Rays
• Neutrino Masses and Mixings from String Theory Instantons
• Neutron Majorana mass from exotic instantons
• Post-Sphaleron baryogenesis and $n-\bar{n}$ oscillation in non-SUSY SO(10) GUT with gauge coupling unification and proton decay
• Phenomenology of SUSY with General Flavour Violation

Cited by in corpus (8)

• 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?
• More about the Instanton/Soliton/Kink correspondence
• Neutron-neutral particle mixing and its observable consequences
• Testing B-violating signatures from Exotic Instantons in future colliders
• A Scotogenic Model as a Prototype for Leptogenesis with One Single Gauge Singlet
• Dineutron decay into sterile anti-neutrinos in neutron stars and its observable consequences
• Weak Gravity Conjecture as a Razor Criterium for Exotic D-brane instantons