Leptonic decay-constant ratio $f_K/f_\pi$ from lattice QCD using 2+1 clover-improved fermion flavors with 2-HEX smearing
Leptonic decay-constant ratio $f_K/f_\pi$ from lattice QCD using 2+1 clover-improved fermion flavors with 2-HEX smearing
复制标题
使用 2 1 三叶草改进的费米子风味和 2-HEX 涂抹,从晶格 QCD 得出轻子衰变常数比 $f_K/f_pi$
DOI:
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发表时间:
2016
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通讯作者:
L. Varnhorst
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作者:
S. Durr;Z. Fodor;C. Hoelbling;S. Krieg;L. Lellouch;T. Lippert;T. Rae;A. Schafer;E. Scholz;K. K. Szab'o;L. Varnhorst
We present a calculation of the leptonic decay-constant ratio $f_K/f_\pi$ in 2+1 flavor QCD, performed via a series of lattice studies, which allows us to quantify all sources of systematic uncertainty. Our final result is $f_K/f_\pi=1.182(28)$, and with isospin breaking corrections from ChPT the charged decay-constant ratio reads $f_{K^\pm}/f_{\pi^\pm}=1.178(28)$. With $V_\mathrm{ud}$ from super-allowed nuclear beta decays, the CKM matrix element $V_\mathrm{us}=0.2282(54)$ is perfectly compatible with the first-row unitarity constraint of the Standard Model.