Possible Interpretations of $D_{sJ}^{+}(2632)$ If It Really Exists

Abstract

We analyze various possible interpretations of the narrow state $D_{sJ}^{+}(2632)$ observed by SELEX Collaboration recently, which lies above threshold and has abnormal decay pattern. These interpretations include: (1) several versions of tetraquarks; (2) conventional $c\bar{s}$ meson such as the first radial excitation of $D_s(2112)$ with abnormally large SU(3) symmetry breaking; (3) conventional $c\bar{s}$ meson with abnormally large $\hat{I}{\cdot }_1$ coupling; (4) heavy hybrid meson. We discuss the physical implications of each interpretation. For example, if the existence of $D_{sJ}^{+}(2632)$ is confirmed as the first radial excitation of $D_s(2112)$ by other experiments, it will be helpful to look for (1) its SU(3) flavor partners $D_J^{0,+}(2530)$; (2) its B-meson analogues $B_J^{0,+}(5840),B_{sJ}^{+}(5940)$; (3) S-wave two pion decay modes.