Semileptonic decay of $B^{-}_c$ into $X(3930)$, $X(3940)$, $X(4160)$

TL;DR

This paper investigates the semileptonic decay of the $B_c^-$ meson into specific resonances and explores how these resonances, generated dynamically from vector-vector interactions, influence decay rates and mass distributions.

Contribution

It introduces a novel approach linking the decay processes to dynamically generated resonances from vector-vector interactions in the charm sector.

Findings

Resonances couple strongly to $D^{*}\bar{D^{*}}$ and $D^{*}_s\bar{D_s^{*}}$ channels.

Decay rates are related to the mass distributions of these vector-vector systems.

Provides predictions for decay observables involving $X(3930)$, $X(3940)$, and $X(4160)$.

Abstract

We study the semileptonic decay of $B^{-}_c$ meson into $\bar{\nu} l^-$ and the isospin zero $X(3930)~(2^{++})$, $X(3940)~(0^{++})$, $X(4160)~(2^{++})$ resonances. We look at the reaction from the perspective that these resonaces appear as dynamically generated from the vector-vector interaction in the charm sector, and couple strongly to $D^{*}\bar{D^{*}}$ and $D^{*}_{s}\bar{D_{s}^{*}}$. We also look into the $B^{-}_c \rightarrow \bar{\nu}_{l} l^- D^{*}\bar{D^{*}}$ and $B^{-}_c \rightarrow \bar{\nu}_{l} l^- D^{*}_{s}\bar{D_{s}^{*}}$ reactions close to threshold and relate the $D^{*}\bar{D^{*}}$ and $D^{*}_{s}\bar{D_{s}^{*}}$ mass distribution to the rate of production of the $X$ resonances.