Prediction of various observables for $B_s^0 \to D_s^{(*)-}\ell^+\nu_\ell$ within covariant confined quark model

TL;DR

This paper predicts various observables for the semileptonic decay $B_s^0 o D_s^{(*)-} u_ u$ using a covariant confined quark model, aiding the search for new physics beyond the Standard Model.

Contribution

It provides new calculations of decay observables for all lepton flavors within a covariant confined quark model, complementing existing theoretical approaches.

Findings

Predicted forward-backward asymmetry for different lepton flavors.

Calculated polarization observables across lepton flavors.

Compared results with other theoretical models.

Abstract

In 2020, the LHCb collaboration reported the exclusive branching fractions for the channels $B_s^0 \to D_s^{(*)-}\mu^+\nu_\mu$ for the very first time. In view of these observations, we have recently reported the form factors and branching fraction computations for these channels employing the covariant confined quark model. As different other channels corresponding to $b \to c \ell \nu_\ell$ have provided the hint for New Physics, the analysis of observables such as forward-backward asymmetry, longitudinal and transverse polarizations across the lepton flavours can serve as one of the important probes for the search for possible New Physics. In present work, we compute these observables for all the lepton flavours and compare our predictions with the other theoretical approaches.