Relativistic description of weak decays of $B_s$ mesons

TL;DR

This paper presents a relativistic quark model calculation of $B_s$ meson decay branching fractions, accurately determining form factors across all kinematic ranges and aligning well with experimental data.

Contribution

It introduces a relativistic approach to compute $B_s$ decay form factors directly from meson wave functions without extrapolation, improving theoretical predictions.

Findings

Form factors are explicitly calculated over the entire kinematic range.

Predicted branching fractions agree well with experimental measurements.

The model provides a reliable framework for studying $B_s$ decays.

Abstract

The branching fractions of the semileptonic and rare $B_s$ decays are calculated in the framework of the QCD-motivated relativistic quark model. The form factors of the weak $B_s$ transitions are expressed through the overlap integrals of the initial and final meson wave functions in the whole accessible kinematical range. The momentum transfer dependence of the form factors is explicitly determined without additional model assumptions and extrapolations. The obtained results agree well with available experimental data.