Common origin of baryon asymmetry and proton decay

TL;DR

This paper proposes a unified model linking the origin of baryon asymmetry and proton decay through leptoquark scalars and Higgs triplets, providing testable predictions for proton decay.

Contribution

It introduces a novel model combining leptoquarks and Higgs triplets to connect baryogenesis with proton decay, extending the canonical seesaw framework.

Findings

Leptoquark scalars can mediate proton decay at TeV scale.

Higgs triplet decays generate baryon-minus-lepton asymmetry.

Model provides testable predictions for proton decay experiments.

Abstract

A successful baryogenesis theory requires a baryon-minus-lepton number violation if it works before the electroweak phase transition. The baryon-minus-lepton number violation could also exist in some proton decay modes. We propose a model to show that the cosmological baryon asymmetry and the proton decay could have a common origin. Specifically, we introduce an isotriplet and two isosinglet leptoquark scalars as well as two isotriplet Higgs scalars to the canonical seesaw model. The decays of the Higgs triplets can generate a desired baryon-minus-lepton asymmetry in the leptoquarks. After the Higgs triplets pick up their seesaw-suppressed vacuum expectation values, the leptoquarks with TeV-scale masses can mediate a testable proton decay.