Effects of scalar leptoquark on semileptonic $\Lambda_b$ decays

TL;DR

This paper investigates how scalar leptoquarks influence rare $ ext{Lambda}_b$ baryon decays, revealing significant deviations from Standard Model predictions in various observables and exploring lepton flavor violation effects.

Contribution

It provides the first detailed analysis of scalar leptoquark impacts on $ ext{Lambda}_b$ decay observables and lepton flavor violating processes.

Findings

Significant deviations in decay observables due to leptoquark effects

Branching ratios for lepton flavor violating decays are around $10^{-10}$ to $10^{-9}$

Leptoquark effects could be detectable in future experiments

Abstract

We study the scalar leptoquark effects on the rare semileptonic decays of $\Lambda_b$ baryon, governed by the quark level transition $b \to s l^+ l^-$. We estimate the branching ratios, forward-backward asymmetries, lepton polarization parameters and the lepton flavour non-universality effects in these decay channels. We find significant deviations from the corresponding standard model predictions in some of the observables due to leptoquark effects. We also investigate the lepton flavour violating decays $\Lambda_b \to \Lambda l_i^- l_j^+$, the branching ratios of which are found to be ${\cal O}(10^{-10} - 10^{-9})$.