Analysis of the semileptonic Bc Dₛ^*^+ ^- decay mode in the effective field theory approach

Discrepancies have been noted between experimental measurements and Standard Model predictions for various observables related to the B (K, K^*, ) ll processes. Recently, the Belle-II Collaboration observed a 2. 8 deviation from Standard Model predictions in the branching ratio of the B K ₗ ₗ decay mode. In this context, we investigate the exclusive semileptonic Bc Dₛ^*^+ ^- decay mode, mediated by b s quark level transition, using Effective Field Theory formalism. We perform a global fit to the new parameters using existing experimental data on b s ^+ ^-. We then estimate the branching ratio and other observables such as forward-backward asymmetry, lepton polarisation asymmetry, and the lepton non-universality parameter of the Bc Dₛ^ (*) ^+ ^- process. Although this process has not yet been detected experimentally, we offer predictions and discuss the observables for Bc Dₛ^*^+ ^- in both the Standard Model and potential new physics scenarios.