# Analysis of ${\Lambda}_b\rightarrow{\Lambda}l^+ l^-$ rare decays in a non-universal $Z'$ model

## TL;DR

This paper studies rare baryonic decays involving Lambda_b particles within a non-universal Z' model, analyzing various asymmetries and decay rates to identify potential deviations from the Standard Model that suggest new physics.

## Contribution

It introduces an analysis of Lambda_b to Lambda l+ l- decays considering Z'-mediated FCNCs, highlighting significant deviations from SM predictions as potential signals of new physics.

## Key findings

- Significant deviations from SM in decay rates and asymmetries.
- Potential indication of new physics from Z' gauge boson effects.
- Enhanced sensitivity of observables to Z' contributions.

## Abstract

We investigate the rare baryonic ${\Lambda}_b\rightarrow{\Lambda}l^+ l^-$ decays in a non-universal $Z'$ model, which is one of the well-motivated extensions of the standard model (SM). Considering the effects of $Z'$-mediated flavour-changing neutral currents (FCNCs) we analyse the differential decay rate, forward-backward asymmetries and lepton polarisation asymmetries for the ${\Lambda}_b\rightarrow{\Lambda}l^+ l^-$ decays. We find significant deviations from their SM predictions, which could indicate new physics arising from the $Z'$ gauge boson.

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Source: https://tomesphere.com/paper/1705.10458