Baryon Number Violation via Majorana Neutrinos in the Early Universe, at the LHC, and Deep Underground

TL;DR

This paper introduces dexiogenesis, a minimal and testable baryogenesis model involving Majorana neutrinos, predicting unique LHC signatures and potential signals in nucleon decay experiments, with a possible grand unified theory origin.

Contribution

It proposes a novel baryogenesis framework using baryon number violation via Majorana neutrinos, linking collider signals with nucleon decay and grand unified theories.

Findings

Predicts same-sign top quark signatures at the LHC.

Identifies parameter space for observable nucleon decay.

Provides a UV completion with a color-triplet scalar.

Abstract

We propose and investigate a novel, minimal, and experimentally testable framework for baryogenesis, dubbed dexiogenesis, using baryon number violating effective interactions of right-handed Majorana neutrinos responsible for the seesaw mechanism. The distinct LHC signature of our framework is same-sign top quark final states, possibly originating from displaced vertices. The region of parameters relevant for LHC phenomenology can also yield concomitant signals in nucleon decay experiments. We provide a simple ultraviolet origin for our effective operators, by adding a color-triplet scalar, which could ultimately arise from a grand unified theory.