Finding a clean process $B^- \to K^- D^0 K^0$ to probe absolutely exotic four-quark states

TL;DR

This paper proposes a clean experimental process to search for the exotic four-quark state $T_{c\bar{s}0}(2900)^0$ in $B^- \to K^- D^0 K^0$ decays, aiming to clarify its nature through invariant mass distribution analysis.

Contribution

It introduces a new decay channel analysis to detect the exotic state $T_{c\bar{s}0}(2900)^0$ with estimated significant contribution, aiding future experimental investigations.

Findings

Estimated fit fraction of $T_{c\bar{s}0}(2900)^0$ is about 9.72%.

Suggests the process is suitable for experimental searches at Belle II and LHCb.

Provides theoretical support for experimental identification of the exotic state.

Abstract

Motivated by the observations of $T_{c\bar{s}0}(2900)^0$ and $T_{c\bar{s}0}(2900)^{++}$, we propose to search for $T_{c\bar{s}0}(2900)^0$ in the cleaner process $B^- \to K^- D^0 K^0$. In the $D^*K^*$ molecular picture, our estimates suggest that $T_{c\bar{s}0}(2900)^0$ should contribute significantly to the $D^0 K^0$ invariant mass distribution in $B^- \to K^- D^0 K^0$, as reported by the Belle II Collaboration. The corresponding fit fraction is estimated to be $(9.72\pm 3.92)\%$. Further precise measurements of this process at Belle II and LHCb could help clarify the nature of $T_{c\bar{s}0}(2900)$.