Charmed and φ meson decay constants from 2+1-flavor lattice QCD

• 来源期刊: 中国物理C（英文版）
• 年，卷（期）: 2021,（2）
• 所属期刊栏目: PARTICLES AND FIELDS
• 页码范围: 200-210
• 页数: 11页
• 语种: 英文
• DOI: 10.1088/1674-1137/abcd8f

摘要

On a lattice with 2+1-flavor dynamical domain-wall fermions at the physical pion mass,we calculate the decay constants of D(*),D(*),and 0.The lattice size is 483 × 96,which corresponds to a spatial extension of～5.5 fm,with a lattice spacing of a ≈ 0.114 fm.For the valence light,strange,and charm quarks,we use overlap fermi-ons at several mass points close to their physical values.Our results at the physical point are fD = 213(5)MeV,fDs = 249(7)MeV,fDy = 234(6)MeV,fD;= 274(7)MeV,and fφ= 241(9)MeV.The couplings of D* and Ds* to the tensor current(fy)can be derived from ratios fTD./fD = 0.91(4)and fTDs/fD*s;= 0.92(4),respectively,which are the first lattice quantum chromodynamics(QCD)results.We also obtain ratios fD*/fD = 1.10(3)and fD*s/fD,= 1.10(4),which reflect the size of heavy quark symmetry breaking in charmed mesons.Ratios fDs/fD = 1.16(3)and fD*s/fD*,= 1.17(3)can be taken as a measure of SU(3)flavor symmetry breaking.