Bottomed baryon decays with invisible Majorana fermions

TL;DR

This paper investigates the potential for bottomed baryon decays to produce invisible Majorana fermions, providing model-independent predictions for decay rates that could be tested in future experiments like Belle II.

Contribution

It offers the first comprehensive analysis of bottomed baryon decays involving invisible Majorana fermions using a model-independent effective Lagrangian approach.

Findings

Decay branching ratios can be as high as 9.2% for certain channels.

Some decay modes are within reach of future experimental detection.

Predicted decay rates depend on the Majorana fermion mass and coupling constants.

Abstract

We study the invisible Majorana fermions of $\chi$ in bottomed baryon decays with flavor-changing neutral currents (FCNCs) based on the model-independent effective Lagrangian between the quarks and invisible particles. From the bounds of the coupling constants extracted from the experiments, we examine the decay branching ratios of $\Lambda_b\to\Lambda\chi\chi$, $\Xi_b^{0(-)}\to\Xi^{0(-)}\chi\chi$, $\Lambda_b\to n \chi\chi$, $\Xi_b^{-}\to \Sigma^{-} \chi\chi$, $\Xi_b^{0}\to \Sigma^{0} \chi\chi$, and $\Xi_b^{0}\to \Lambda \chi\chi$, which can be as large as $6.3,~9.2,~5.7,~5.8,~2.7$, and $1.0\times10^{-5}$ for $m_\chi=2$ GeV, respectively. Some of these decays are accessible to the future experimental searches, such as Belle II.