Leptonic decay-constant ratio $f_K/f_\pi$ from clover-improved $N_f=2+1$ QCD
Leptonic decay-constant ratio $f_K/f_\pi$ from clover-improved $N_f=2+1$ QCD
复制标题
来自 Clover 改进的 $N_f=2 1$ QCD 的轻子衰变常数比 $f_K/f_pi$
DOI:
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发表时间:
2016
期刊:
影响因子:
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通讯作者:
S. Durr
中科院分区:
文献类型:
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作者:
E. Scholz;S. Durr
The leptonic decay-constant ratio $f_K/f_\pi$ is calculated from lattice-QCD simulations using $N_f=2+1$ dynamical fermion flavors in the clover-improved formulation and 2-HEX smearing. The simulations were performed for a range of mass-degenerate light quarks including the physical point and at various lattice couplings and volumes, allowing to quantify all relevant sources of systematic uncertainties for our final number of the decay-constant ratio. Utilizing input from chiral perturbation theory, we also quote the charged decay-constant ratio $f_{K^\pm}/f_{\pi^\pm}$. With further input from super-allowed nuclear $\beta$-decays, eventually we obtain an estimate for the CKM-matrix element $V_{\rm us}$.