We scrutinize the penguin dominated $B_s\to K^{+}{K}^{-}$ decay mode involving $b\to s$ quark level transition in family nonuniversal $Z^{\prime }$ and vectorlike 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 predictions. 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.

• Received 5 November 2019
• Accepted 11 March 2020

DOI:https://doi.org/10.1103/PhysRevD.101.075033

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP³.

Published by the American Physical Society