# Study of $ B_s^0\rightarrow l^+ l^-\gamma $ decays in the nonuniversal Z' model

## TL;DR

This paper explores how a nonuniversal Z' model affects the decay processes of B_s^0 mesons into leptons and a photon, showing significant deviations from Standard Model predictions and highlighting potential signals of new physics.

## Contribution

It provides the first detailed calculation of branching ratios and asymmetries for B_s^0 decays in a nonuniversal Z' model, emphasizing the impact of Z' couplings on observable quantities.

## Key findings

- Branching ratios are increased by an order of magnitude compared to SM.
- Forward-backward asymmetry varies significantly with Z' couplings.
- Results suggest potential for experimental discrimination of NP effects.

## Abstract

We investigate $ B_s^0\rightarrow l^+ l^-\gamma $ decays in a nonuniversal Z' model derived from extension of the standard model (SM). Considering the Z'-mediated flavor changing neutral current (FCNC) effects we calculate the branching ratio and forwardbackward asymmetry for $ B_s^0\rightarrow l^+ l^-\gamma $ decay processes. We compare the obtained results with predictions of the SM and discuss the sensitivity of the observables to Z' boson coupling parameters. We find the branching ratios are enhanced by one order from SM predictions in Z' model scenario. We also observe the variation of forward-backward asymmetry with the Z' boson coupling parameters portrait discrimination between NP effects and SM results.

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Source: https://tomesphere.com/paper/1701.02517