摘要
Decay constants of pseudoscalar mesons D,D_(s),η_(c) and vector mesons D^(*),D_(s)^(*),J/ψ are determined from the N_(f)=2+1 lattice QCD at a lattice spacing a~0.08 fm.For vector mesons,the decay constants defined by tensor currents are given in the MS scheme at 2 GeV.The calculation is performed on domain wall fermion configurations generated by the RBC-UKQCD collaborations and the overlap fermion action is used for the valence quarks.Comparing the current results with our previous results at a coarser lattice spacing a ~0.11 fm provides a better understanding of the discretization error.We obtain f_(D_(s)^(*))^(T)(MS,2 GeV)/f_(D_(s)^(*))=0.909(18)with a better precision than our previous result.Combining our f_(D_(s)^(*))=277(11)MeV with the total width of D_(s)^(*) determined in a recent study gives a branching fraction 4.26(52)×10^(-5) for D_(s)^(*) leptonic decay.
作者
Dong-Hao Li
Ying Chen
Ming Gong
Keh-Fei Liu
Zhaofeng Liu
Ting-Xiao Wang
李东浩;陈莹;宫明;刘克非;刘朝峰;王庭霄(MOE Frontiers Science Center for Rare Isotopes,and School of Nuclear Science and Technology,Lanzhou University,Lanzhou 730000,China;Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China;School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China;Department of Physics and Astronomy,University of Kentucky,Lexington,Kentucky 40506,USA;Nuclear Science Division,Lawrence Berkeley National Laboratory,Berkeley,California 94720,USA;Center for High Energy Physics,Peking University,Beijing 100871,China)
基金
Supported in part by the National Key Research and Development Program of China(2020YFA0406400,2023YFA1606002)
the National Natural Science Foundation of China(12075253,11935017,12192264,12293060,12293065,12293063,12070131001)
CRC 110 by DFG and NNSFC
supported by the U.S.DOE Grant(DE-SC0013065)and DOE Grant(DEAC05-06OR23177),which is within the framework of the TMD Topical Collaboration。
