Angular observables and branching ratio for Bs → φℓ+ℓ− decay

An analysis of the Bs → φℓ+ℓ− rare decay within the covariant confined quark model is performed in this article. The Bs → φ transition form factors are calculated and then used to compute the branching fractions and angular observables in various q2 bins, including the forward-backward asymmetry AFB, the longitudinal polarization FL, and the optimized observables Ai and Si. Angular observables and branchings were calculated for the bins that were presented by the LHCb collaboration. Generally CCQM predictions are consistent with data from LHCb collaboration within the error bars. However, the largest discrepancy is observed in the forward-backward asymmetry of AFB for the bin [6,8] GeV2 due to the reverse signs. Discrepancies are also observed in the observed values of AFB and A5 for the bins [11,12.5] and [15,18.9] GeV2.