Ratio F K / F π in QCD
Ratio F K / F π in QCD
复制标题
DOI:
10.1103/physrevd.81.054507
复制
发表时间:
2010-01
期刊:
影响因子:
--
通讯作者:
S. Durr;Z. Fodor;C. Hoelbling;S. Katz;S. Krieg;T. Kurth;L. Lellouch;Thomas Lippert;À. Ramos;K. Szabó
中科院分区:
文献类型:
--
作者:
S. Durr;Z. Fodor;C. Hoelbling;S. Katz;S. Krieg;T. Kurth;L. Lellouch;Thomas Lippert;À. Ramos;K. Szabó
We determine the ratio F K /F π in QCD with N f = 2 + 1 flavors of sea quarks, based on a series of lattice calculations with three different lattice spacings, large volumes, and a simulated pion mass reaching down to about 190 MeV. We obtain F K /F π = 1.192(7) stat (6) sys . This result is then used to give an updated value of the Cabibbo-Kobayashi-Maskawa) matrix element |V us |. The unitarity relation for the first row of this matrix is found to be well observed.