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

• DOI: 10.1088/1674-1137/abcd8f
• Publication Date: 2020-11-25T07:18:09Z
• Authors: Ying Chen; Wei-Feng Chiu; Ming Gong; Zhaofeng Liu; Yunheng Ma
• Keywords: Lattice constant; Lattice (music); Charm quark; D meson

On a lattice with 2+1-flavor dynamical domain-wall fermions at the physical pion mass, we calculate decay constants of $D_{s}^{(*)}$, $D^{(*)}$ and $\phi$. The size is $48^3\times96$, which corresponds to spatial extension $\sim5.5$ fm spacing $a\approx 0.114$ fm. For valence light, strange charm quarks, use overlap several mass points close their values. Our results point are $f_D=213(5)$ MeV, $f_{D_s}=249(7)$ $f_{D^*}=234(6)$ $f_{D_s^*}=274(7)$ $f_\phi=241(9)$ MeV. couplings $D^*$ $D_s^*$ tensor current ($f_V^T$) can be derived, respectively, from ratios $f_{D^*}^T/f_{D^*}=0.91(4)$ $f_{D_s^*}^T/f_{D_s^*}=0.92(4)$, first QCD results. We also obtain $f_{D^*}/f_D=1.10(3)$ $f_{D_s^*}/f_{D_s}=1.10(4)$, reflect heavy quark symmetry breaking in charmed mesons. $f_{D_s}/f_{D}=1.16(3)$ $f_{D_s^*}/f_{D^*}=1.17(3)$ taken as measure SU(3) flavor breaking.