Exploring the simplest purely baryonic decay processes

TL;DR

This paper proposes searching for purely baryonic decay processes at LHCb, focusing on the decay $ ext{Lambda}_b^0 o p ar{p} n$, which could shed light on baryon asymmetry and is experimentally accessible.

Contribution

It introduces the first detailed prediction and experimental proposal for the simplest purely baryonic decay mode, $ ext{Lambda}_b^0 o p ar{p} n$, including its estimated branching ratio.

Findings

Predicted branching ratio of $ ext{Lambda}_b^0 o p ar{p} n$ is approximately 2 x 10^{-6}.

Decay mode is accessible to LHCb experiment.

Extension to other baryonic decay modes is feasible.

Abstract

Though not considered in general, purely baryonic decays could shed light on the puzzle of the baryon number asymmetry in the universe by means of a better understanding of the baryonic nature of our matter world. As such, they constitute a yet unexplored class of decay processes worth investigating. We propose to search for purely baryonic decay processes at the LHCb experiment. No such type of decay has ever been observed. In particular, we concentrate on the decay $\Lambda_b^0\to p\bar pn$, which is the simplest purely baryonic decay mode, with solely spin-1/2 baryons involved. We predict its decay branching ratio to be ${\cal B}(\Lambda_b^0\to p\bar pn)=(2.0^{+0.3}_{-0.2})\times 10^{-6}$, which is sufficiently large to make the decay mode accessible to LHCb. Our study can be extended to other purely baryonic decays such as $\Lambda_b^0\to p\bar p \Lambda$ and $\Lambda_b^0\to \Lambda\bar \Lambda\Lambda$, as well as to similar decays of anti-triplet $b$-baryons such as $\Xi_b^{0,-}$.