Predicting charmed-strange molecular tetraquarks with $K^{(\ast )}$ and $T$-doublet charmed or anticharmed meson

Abstract

In this work, we first present a systematic investigation of the $T_{\bar{c}\bar{s}}$-type charmed-strange molecular tetraquark candidates composed of a $K^{(\ast )}$ meson and a $T$-doublet anticharmed meson using the one-boson-exchange model, which exhibit exotic flavor content $\bar{c}\bar{s}qq$. Our results suggest that the $K^{\ast }{\bar{D}}_1$ states with $I(J^P)=0(0^{-},1^{-})$ and the $K^{\ast }{\bar{D}}_2^{\ast }$ states with $I(J^P)=0(1^{-},2^{-})$ represent the most promising candidates of the $T_{\bar{c}\bar{s}}$-type charmed-strange molecular tetraquarks, while the coupled $K{\bar{D}}_1/K^{\ast }{\bar{D}}_1/K^{\ast }{\bar{D}}_2^{\ast }$ system with $I(J^P)=0(1^{-})$ and the coupled $K{\bar{D}}_2^{\ast }/K^{\ast }{\bar{D}}_1/K^{\ast }{\bar{D}}_2^{\ast }$ system with $I(J^P)=0(2^{-})$ can only be regarded as the possible candidates of the $T_{\bar{c}\bar{s}}$-type charmed-strange molecular tetraquarks. We further extend our analysis to the $K^{(\ast )}{D}_1/K^{(\ast )}{D}_2^{\ast }$ systems, where our results suggest a series of $T_{c\bar{s}}$-type charmed-strange molecular tetraquark candidates. These findings provide a comprehensive picture of the molecular spectrum in the charmed-strange tetraquark sector composed of $S$-wave kaons and (anti-)charmed mesons in the $T$-doublet and can be tested in future experimental studies.

13 pages, 6 figures, and 6 tables

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