2024/07/04 by Li, Donghao, Chen, Ying, Gong, Ming +3 · 1 citation
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Lattice (hep-lat) #High Energy Physics - Phenomenology (hep-ph)
paper · doi:10.48550/arxiv.2407.03697
Decay constants of pseudoscalar mesons D, Ds, ηc and vector mesons D^*, Ds^*, J/ψ are determined from Nf=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 \rm 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 ones at a coarser lattice spacing a∼0.11 fm gives us a better understanding of the discretization error. We obtain fDs^*T(\rm MS,2 GeV)/fDs^*=0.907(20) with a better precision than our previous result. Combining our fDs^*=277(11) MeV with the total width of Ds^* determined in a recent work gives a branching fraction 4.26(52)×10-5 for Ds^* leptonic decay.