Inspection of new physics in $\rm B_s^0 \to K^+K^-$ decay mode

TL;DR

This paper investigates potential new physics effects in the $B_s^0 o K^+K^-$ decay, analyzing discrepancies between standard model predictions and experimental data, and constraining new physics models using existing experimental limits.

Contribution

It explores the impact of family non-universal $Z'$ and vector-like down quark models on $B_s o K^+K^-$ decay, providing new constraints and analyzing deviations from the SM.

Findings

Discrepancies between SM predictions and experimental measurements of branching ratios and CP asymmetries.

Constraints on new physics parameter space from leptonic $B_s$ decay limits.

Potential effects of new physics on decay observables.

Abstract

We scrutinize the penguin dominated $ B_s \to K^+ K^-$ decay mode involving $b \to s$ quark level transition in family non-universal $Z^ \prime$ and vector-like down quark model. There is discrepancy in the standard model branching ratio value of this mode with the experimental results reported by Belle, CDF and LHCb Collaborations. Additionally, the measured values of CP-violating asymmetries $ C_{K^+K^-}$ and $ S_{K^+K^-}$ deviate from the SM results. We constrain the new parameter space by using the existing experimental limits on leptonic $ B_s\to \ell \ell$ ($\ell = e, \mu, \tau$) processes. We then check the effects of new physics on the branching ratio and CP violating parameters of the $ B_s \to K^+ K^-$ process.