Weak B Decays into Orbitally Excited Charmed Mesons

TL;DR

This paper evaluates the branching fractions of B meson decays into orbitally excited charmed mesons using a constituent quark model, aligning theoretical predictions with recent BaBar experimental results.

Contribution

It introduces a two-step constituent quark model approach to calculate semileptonic B decays into excited charmed mesons, matching experimental data.

Findings

The model's predictions agree with BaBar measurements.

The approach effectively describes the decay processes involving excited charmed mesons.

Provides a theoretical framework for future decay studies.

Abstract

The BaBar Collaboration has recently reported branching fractions for semileptonic decays of the $B$ meson 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 within the framework of a constituent quark model in two steps, one which involves a semileptonic decay and the other one mediated by a strong process. Our results are in agreement with the experimental data.