Exclusive decays $B \to \ell^-\bar\nu$ and $B \to D^{(\ast)}\ell^-\bar\nu$ in the covariant quark model

TL;DR

This paper employs a covariant quark model with infrared confinement to compute form factors for exclusive leptonic and semileptonic B decays across all momentum transfers, providing theoretical predictions aligned with experimental data.

Contribution

It introduces a comprehensive calculation of form factors in the covariant quark model for B decays, covering the full kinematic range and including polarization observables.

Findings

Calculated form factors agree with experimental data.

Predicted branching fractions match observed values.

Provided detailed polarization observable predictions.

Abstract

We study the exclusive leptonic and semileptonic $B$ decays $B \to \ell^- \bar\nu$ and $B \to D^{(\ast)} \ell^-\bar\nu$ in the framework of the covariant quark model with built-in infrared confinement. We compute the relevant form factors in the full kinematical momentum transfer region. The calculated form factors are used to evaluate branching fractions and polarization observables of the above transitions. We compare our results with experimental data and results from other theoretical studies.