论文标题
Charmed和$ ϕ $ Meson Decay常数来自2+1-Fravor Lattice QCD
Charmed and $ϕ$ meson decay constants from 2+1-flavor lattice QCD
论文作者
论文摘要
在带有2+1型风力的动力域壁壁费的晶格上，我们计算$ d_ {s}^{（*）} $，$ d^{（*）} $和$ ϕ $的衰减常数。晶格尺寸为$ 48^3 \ times96 $，对应于$ \ sim5.5 $ fm的空间扩展名，晶格间距$ a \ a \大约0.114 $ fm。对于价光，奇怪和魅力的夸克，我们在几个质量点上使用重叠的费米，接近其物理价值。我们在物理点上的结果是$ f_d = 213（5）$ MEV，$ f_ {d_s} = 249（7）$ MEV，$ f_ {d^*} = 234（6）$ MEV，$ f_ {d_s^*} = 274（7）$ mev，以及$ f_mev，以及$ f_vist = 241（9）$ MEV。可以分别从比率$ f_ {d^*}^t/f_ {d^*} = 0.91（4）（4）$ f_S $ f_s^} $ f_s^*}^t/f_s $ f_*} $ f_*} $ f_*} $ f_*} d_}（d_s $ f_s^*}^$ f _}（4）（d_s^t/f _s $ f_s^*}^$ f_*} d_s} d_s} d_} d_} d_} d_} d_}（d_s）（4）晶格QCD结果。我们还获得了比率$ f_ {d^*}/f_d = 1.10（3）$和$ f_ {d_s^*}/f_ {d_s} = 1.10（4）$，这反映了在魅力中的重型夸克对称性的大小。比率$ f_ {d_s}/f_ {d} = 1.16（3）$和$ f_ {d_s^*}/f_ {d^*} = 1.17（3）$可以作为SU（3）风味对称性的量度。
On a lattice with 2+1-flavor dynamical domain-wall fermions at the physical pion mass, we calculate the decay constants of $D_{s}^{(*)}$, $D^{(*)}$ and $ϕ$. The lattice size is $48^3\times96$, which corresponds to a spatial extension of $\sim5.5$ fm with the lattice spacing $a\approx 0.114$ fm. For the valence light, strange and charm quarks, we use overlap fermions at several mass points close to their physical values. Our results at the physical point are $f_D=213(5)$ MeV, $f_{D_s}=249(7)$ MeV, $f_{D^*}=234(6)$ MeV, $f_{D_s^*}=274(7)$ MeV, and $f_ϕ=241(9)$ MeV. The couplings of $D^*$ and $D_s^*$ to the tensor current ($f_V^T$) can be derived, respectively, from the ratios $f_{D^*}^T/f_{D^*}=0.91(4)$ and $f_{D_s^*}^T/f_{D_s^*}=0.92(4)$, which are the first lattice QCD results. We also obtain the ratios $f_{D^*}/f_D=1.10(3)$ and $f_{D_s^*}/f_{D_s}=1.10(4)$, which reflect the size of heavy quark symmetry breaking in charmed mesons. The ratios $f_{D_s}/f_{D}=1.16(3)$ and $f_{D_s^*}/f_{D^*}=1.17(3)$ can be taken as a measure of SU(3) flavor symmetry breaking.
