Study of the excited 1 - charm and charm–strange mesons

Abstract

We give a systematical study on the recently reported excited charm and charm–strange mesons with potential 1 - spin–parity, including the Ds1∗(2700)+, Ds1∗(2860)+, D∗(2600) 0, D∗(2650) 0, D1∗(2680)0 and D1∗(2760)0. The main strong decay properties are obtained in the framework of Bethe–Salpeter (BS) methods. Our results reveal that the two 1 - charm–strange mesons can be well described by the further 23S1–13D1 mixing scheme with a mixing angle of (8.7-3.2+3.9)∘. The predicted decay ratio B(D∗K)B(DK) for Ds1∗(2860) is 0.62-0.12+0.22. D∗(2600) 0 can also be explained as the 23S1 predominant state with a mixing angle of -(7.5-3.3+4.0)∘. Considering the mass range, D∗(2650) 0 and D1∗(2680)0 are more likely to be the 23S1 predominant states, although the total widths under the two 23S1 and 13D1 assignments have no great conflict with the current experimental data. The calculated width for the LHCb D1∗(2760)0 seems to be about 100 MeV larger than the experimental measurement if taking it as 13D1 or 13D1 dominant state cu¯. The comparisons with other calculations and several important decay ratios are also presented. For the identification of these 1 - charm mesons, further experimental information, such as B(Dπ)B(D∗π), is necessary.