The newly observed open-charm states in quark model

Abstract

Comparing the measured properties of the newly observed open-charm states D(2550), D(2600), D(2750), D(2760), D_{s1}(2710), D_{sJ}(2860), and D_{sJ}(3040) with our predicted spectroscopy and strong decays in a constituent quark model, we find that: (1) the $D(2{}^1{S}_0)$ assignment to D(2550) remains open for its too broad width determined by experiment; (2) the D(2600) and $D_{s1}(2710)$ can be identified as the $2{}^3{S}_1$-$1{}^3{D}_1$ mixtures; (3) if the D(2760) and D(2750) are indeed the same resonance, they would be the $D(1{}^3{D}_3)$; otherwise, they could be assigned as the $D(1{}^3{D}_3)$ and $D_2^{\prime }(1D)$, respectively; (4) the $D_{sJ}(2860)$ could be either the $D_{s1}(2710)$'s partner or the $D_s(1{}^3{D}_3)$; and (5) both the $D_{s1}(2P)$ and $D_{s1}^{\prime }(2P)$ interpretations for the $D_{sJ}(3040)$ seem likely. The $E1$ and $M1$ radiative decays of these sates are also studied. Further experimental efforts are needed to test the present quarkonium assignments for these new open-charm states.

Comments: 26 pages,7 figures, journal version