Eur. Phys. J. C (2011) 71: 1582
https://doi.org/10.1140/epjc/s10052-011-1582-9

Regular Article - Theoretical Physics

The newly observed open-charm states in quark model

Department of Physics, Zhengzhou University, Zhengzhou, Henan, 450052, People’s Republic of China

^* e-mail: lidm@zzu.edu.cn

Received: 17 November 2010
Revised: 27 January 2011
Published online: 10 March 2011

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 , 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 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.