Strong decays of the possible $D^{\ast }K$ and ${\bar{D}}^{\ast }K$ molecules

Abstract

Inspired by the rich spectrum of structures near the $D^{(\ast )}{K}^{(\ast )}/{\bar{D}}^{(\ast )}{K}^{(\ast )}$ thresholds, we postulate the existence of $S$-wave $D^{\ast }K$ and ${\bar{D}}^{\ast }K$ molecules, denoted as $T_{c\bar{s}1}^f(2460)$ with $I=0$ (corresponding to $D_{s1}(2460)$), $T_{c\bar{s}1}^a(2470)$ with $I=1$, $T_{\bar{c}\bar{s}1}^f(2460)$ with $I=0$, and $T_{\bar{c}\bar{s}1}^a(2470)$ with $I=1$, respectively. Using an effective Lagrangian approach, we investigate the strong decays of these molecular states. Our estimates indicate that the width of $T_{c\bar{s}1}^a(2470)$ is roughly three orders of magnitude larger than that of $T_{c\bar{s}1}^f(2460)$, while the widths of $T_{\bar{c}\bar{s}1}^{a/f}(2470)$ are of the same orders as that of $T_{c\bar{s}1}^f(2460)$. The present study may provide valuable clues for the experimental search for these molecular candidates.

Comments: 9 pages, 8 figures