The roles of the $T_{c\bar{s}0}(2900)^0$ and $D_0^*(2300)$ in the process $B^-\to D_s^+K^-\pi^-$

TL;DR

This paper investigates the roles of the $T_{car{s}0}(2900)^0$ and $D_0^*(2300)$ resonances in the decay $B^- o D_s^+K^-\pi^-$, explaining recent experimental observations and predicting related invariant mass distributions.

Contribution

The study provides a theoretical analysis of the decay process including contributions from specific S-wave interactions, explaining experimental enhancements and predicting signals of the $T_{car{s}0}(2900)$ resonance.

Findings

The $D_s^+K^-$ invariant mass distribution shows an enhancement near threshold, consistent with $D_0^*(2300)$.

Predicted $D_s^+ o ext{pion}$ invariant mass and Dalitz plots indicate a significant $T_{car{s}0}(2900)$ signal.

The $D_s^-K_s^0$ invariant mass distribution reproduces Belle measurements, with a peak around 2900 MeV for $T_{car{s}0}(2900)$.

Abstract

Motivated by the recent LHCb observations of $T_{c\bar{s}0}(2900)^0$ and $T_{c\bar{s}0}(2900)^{++}$ in the processes $B^0\to\bar{D}^0D_s^+\pi^-$ and $B^+\to D^-D_s^+\pi^+$, we have investigated the decay $B^-\to D_s^+K^-\pi^-$ by taking into account the contributions from the $S$-wave vector-vector interactions, and the $S$-wave $D^+_s K^-$ interactions. Our results show that the $D_s^+K^-$ invariant mass distribution has an enhancement structure near the threshold, associated with the $D^*_0(2300)$, which is in good agreement with the Belle measurements. We have also predicted the $D^+_s\pi^-$ invariant mass distribution and the Dalitz plot, which show the significant signal of the $T_{c\bar{s}0}(2900)$. With the same formalism, the $D^-_sK^0_s$ invariant mass distribution of the process $B^0 \to D^-_sK^0_s\pi^+$ measured by Belle could be well reproduced, and the peak of $T_{c\bar{s}0}(2900)$ is expected to be observed around 2900~MeV in the $D^-_s\pi^+$ invariant mass distribution. Our results could be tested by the Belle II and LHCb experiments in the future.