Weak nonleptonic decays of vector B-mesons

TL;DR

This paper investigates the radiative and nonleptonic decays of vector B-mesons using the covariant confined quark model, providing calculations of decay widths, form factors, and comparisons with other approaches.

Contribution

It offers a comprehensive analysis of B-meson decays within the CCQM, including new calculations of decay constants, form factors, and decay widths, aligning with the factorization approach.

Findings

Calculated decay widths for $B^* o B \gamma$ and $B^* o D^* V$ decays.

Determined leptonic decay constants and form factors across the physical momentum transfer region.

Results are consistent with other models and approaches.

Abstract

We study the radiative and weak nonleptonic decays of vector B-mesons within the covariant confined quark model (CCQM) developed in our previous papers. First, we calculate the matrix elements and decays widths of the radiative decays $B^\ast\to B\gamma$. The obtained results are compared with those obtained in other approaches. Then we consider the nonleptonic decays $B^\ast\to D^\ast V$ which proceed via tree-level quark diagrams. It is shown that the analytical expressions for the amplitudes correspond to the factorization approach. In the framework of our model we calculate the leptonic decay constants and the form factors of the $B^\ast\to D^\ast(V)$ transitions in the entire physical region of the momentum transfer squared. Finally, we calculate the two-body decay widths and compare our results with other models.