D ˉ s (?) D (?) molecular state with JP=1+ D ˉ S (?) D (?) MOLECULAR ... XU, LIU, CUI, and HUANG

作者：Xu Y.-J.; Liu Y.-L.; Cui C.-Y.; Huang M.-Q.^*

来源：PHYSICAL REVIEW D, 2021, 104(9): 094028.

DOI：10.1103/PhysRevD.104.094028

In this paper, we construct Dˉs(?)D(?)-molecule-type interpolating currents J(±)μ(x) with JP=1+, calculate the corresponding mass and magnetic moment using the QCD sum rule method and its extension in the weak electromagnetic field, and study the processes of Z(±)cs to ηcK?, J/ψK, DˉDs?, and Dˉ?Ds via three-point sum rules. The numerical values are mZ(±)cs=3.99-0.14+0.17 GeV, λZ(±)cs=2.07-0.16+0.28×10-2 GeV5, and μZ(±)cs=0.18-0.09+0.16 μN with μN the nucleon magneton, ΓZ(+)cs=17.47-8.08+12.70, and ΓZ(-)cs=13.86-6.51+10.37. The masses are in agreement with the recently measured value of Zcs(3985) by the BESIII Collaboration, mZcsexp=(3982.5-2.6+1.8±2.1) MeV. The widths are compatible with the experimental value ΓZcsexp=(12.8-4.4+5.3±3.0) MeV. The magnetic moment and the various decay modes can help us to determine the inner structure of Zcs(3985) when being confronted with experimental data in the future.