$\bar{B}^0$, $\bar{B}^0_s$ and $B^-$ decays into $\eta_c$ plus a scalar meson

TL;DR

This paper presents a theoretical study of $ar{B}$ meson decays into $ ext{eta}_c$ and scalar mesons, modeling scalar mesons as dynamically generated states from pseudoscalar interactions, and predicts invariant mass distributions for these decays.

Contribution

It introduces a model linking scalar mesons to pseudoscalar interactions and predicts decay distributions, aiding understanding of scalar meson nature.

Findings

Predicted invariant mass distributions for various $ar{B}$ decays.

Supported the dynamic generation hypothesis for scalar mesons.

Provided theoretical results to compare with upcoming experimental data.

Abstract

We investigate the decays of $\bar{B}^0_s$, $\bar{B}^0$ and $B^-$ into $\eta_c$ plus a scalar meson in a theoretical framework by taking into account the dominant process for the weak decay of $\bar{B}$ meson into $\eta_c$ and a $q\bar{q}$ pair. After hadronization of this $q\bar{q}$ component into pairs of pseudoscalar mesons we obtain certain weights for the pseudoscalar meson-pseudoscalar meson components. The calculation is based on the postulation that the scalar mesons $f_0(500)$, $f_0(980)$ and $a_0(980)$ are dynamically generated states from the pseudoscalar meson-pseudoscalar meson interactions in $S$-wave. Up to a global normalization factor, the $\pi \pi$, $K \bar{K}$ and $\pi \eta$ invariant mass distributions for the decays of $\bar B^0_s \to \eta_c \pi^+ \pi^-$, $\bar{B}^0_s \to \eta_c K^+ K^-$, $\bar B^0 \to \eta_c \pi^+ \pi^-$, $\bar{B}^0 \to \eta_c K^+ K^-$, $\bar{B}^0 \to \eta_c \pi^0 \eta$, $B^- \to \eta_c K^0 K^-$ and $B^- \to \eta_c \pi^- \eta$ are predicted. Comparison is made with the limited experimental information available and other theoretical calcualtions. Further comparison of these results with coming LHCb measurements will be very valuable to make progress in our understanding of the nature of the low lying scalar mesons, $f_0(500), f_0(980)$ and $a_0(980)$.