Nucleon and dinucleon decays to leptonic final states in a left-right symmetric model with large extra dimensions

TL;DR

This paper investigates baryon-number-violating nucleon and dinucleon decays to leptonic states within a left-right symmetric model featuring large extra dimensions, analyzing how experimental bounds constrain these rare processes.

Contribution

It introduces a detailed analysis of nucleon and dinucleon decays to leptons in a left-right symmetric model with large extra dimensions, incorporating experimental constraints on $v_R$ and decay modes.

Findings

Decay modes are sufficiently suppressed to meet experimental bounds.

Constraints on $v_R$ from $n$-$\bar n$ oscillations are consistent with decay suppression.

The model aligns with current experimental limits on baryon-number-violating decays.

Abstract

We consider baryon-number-violating nucleon and dinucleon decays to leptonic final states in the context of a left-right symmetric (LRS) model with large extra dimensions. Specifically, we study (a) nucleon to trilepton decays with $\Delta B=-1$ and $\Delta L=-3$, and (b) dinucleon to dilepton decays with $\Delta B=-2$ and $\Delta L=-2$. In the LRS model, $B-L$ is gauged and is spontaneously broken by a Higgs vacuum expectation value $v_R$, which characterizes the scale at which processes violating $B-L$ occur. We show that together with the lower bound on $v_R$ from experimental limits on $n$-$\bar n$ oscillations, constraints from searches for other nucleon decay modes imply sufficient suppression of these nucleon to trilepton and dinucleon to dilepton decay modes in this model to agree with experimental bounds.