Testing the molecular nature of $\bm{D_{s 0}^{\ast}(2317)}$ and $\bm{D_{0}^{\ast} (2400)}$ in semileptonic $\bm{B_s}$ and $\bm{B}$ decays

TL;DR

This paper investigates the nature of certain charmed mesons by analyzing semileptonic B meson decays using a chiral unitarity model, providing predictions for decay rates and supporting their molecular interpretation.

Contribution

It introduces a coupled-channel chiral unitarity model to analyze semileptonic B decays into specific scalar mesons, offering new predictions for decay ratios and rates.

Findings

Calculated decay width ratios for B_s and B decays into D* resonances.

Predicted the decay rate for B_s to D_{s0}^*(2317) based on known B decay data.

Supported the molecular nature of D_{s0}^*(2317) and D_0^*(2400) resonances.

Abstract

We study the semileptonic $B_s$ and $B$ decays into the $D_{s 0}^{\ast} (2317)$ and $D_{0}^{\ast} (2400)$ resonances, respectively. With the help of a chiral unitarity model in coupled channels we compute the ratio of the decay widths of both processes. Using current values of the width for the $\bar{B}^{0} \to D_{0}^{\ast} (2400)^{+} \bar{\nu}_{l} l^{-}$ decay we make predictions for the rate of the $\bar{B}_{s}^{0} \to D_{s0}^{\ast} (2317)^{+} \bar{\nu}_{l} l^{-}$ decay.