The newly observed open-charm states in quark model

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 S-1(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 D-3(1) mixtures; (3) if the D(2760) and D(2750) are indeed the same resonance, they would be the D(1 D-3(3)); otherwise, they could be assigned as the D(1 D-3(3)) and D'(2) (1D), respectively; (4) the D-sJ (2860) could be either the D-s1(2710)'s partner or the D-s(1 D-3(3)); and (5) both the D-s1(2P) and D'(s1)(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.