Semileptonic $B$ and $B_{s}$ decays into orbitally excited charmed mesons

TL;DR

This paper evaluates semileptonic B and Bs decays into orbitally excited charmed mesons using a constituent quark model, aligning with experimental data and predicting outcomes for future LHC measurements.

Contribution

The study provides a theoretical framework for calculating branching fractions of semileptonic B and Bs decays into excited charmed mesons, including new predictions for future experiments.

Findings

Results agree with BaBar experimental data.

Predictions made for Bs decays into excited charmed-strange mesons.

The model successfully describes decay processes involving orbitally excited states.

Abstract

The BaBar Collaboration has recently reported products of branching fractions that include $B$ meson semileptonic decays into final states with charged and neutral $D_{1}(2420)$ and $D_{2}^{\ast}(2460)$, two narrow orbitally excited charmed mesons. We evaluate these branching fractions, together with those concerning $D_{0}^{\ast}(2400)$ and $D_{1}'(2430)$ mesons, within the framework of a constituent quark model. The calculation is performed in two steps, one of which involves a semileptonic decay and the other is mediated by a strong process. Our results are in agreement with the experimental data. We also extend the study to semileptonic decays of $B_{s}$ into orbitally excited charmed-strange mesons, providing predictions to the possible measurements to be carried out at LHC.