Rare $b \to d$ decays in covariant confined quark model

TL;DR

This paper calculates form factors and decay observables for rare $b o d$ transitions using a covariant confined quark model, matching experimental data and providing predictions for various physical quantities.

Contribution

It provides comprehensive calculations of form factors and decay observables for $b o d$ decays within a covariant confined quark model, including new ratios and angular observables.

Findings

Branching fractions match experimental data.

Ratios of $b o s$ to $b o d$ decays are computed.

Angular observables are predicted across the full $q^2$ range.

Abstract

In this article, we study the rare decays corresponding to $b \to d$ transition in the framework of the covariant confined quark model. The transition form factors for the channels $B^{+(0)} \to (\pi^{+(0)}, \rho^{+(0)},\omega)$ and $B_s^0 \to K^{(*)0}$ are computed in the entire dynamical range of momentum transfer squared. Using the form factors, we compute the branching fractions of the rare decays and our results are found to be matching well with the experimental data. We also compute the ratios of the branching fractions of the $b \to s$ to $b \to d$ rare decays using the inputs from previous papers on $b \to s \ell^+\ell^-$ using this model. Further, using the form factors, model dependent and independent parameters, we also compute different other physical observables such as forward backward asymmetry, longitudinal polarization and angular observables in the entire $q^2$ range as well as in $q^2$ bins [0.1 -- 0.98] GeV$^2$ and [1.1 -- 6] GeV$^2$. We also compare our findings with different theoretical predictions.