Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2010-01-26
Phys.Rev.D81:054507,2010
Physics
High Energy Physics
High Energy Physics - Lattice
15 pages, 4 figures, 2 tables
Scientific paper
10.1103/PhysRevD.81.054507
We determine the ratio FK/Fpi in QCD with Nf=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 FK/Fpi=1.192 +/- 0.007(stat) +/- 0.006(syst). This result is then used to give an updated value of the CKM matrix element |Vus|. The unitarity relation for the first row of this matrix is found to be well observed.
Asensio Ramos Andrés
Dürr Stephan
Fodor Zoltan
Hoelbling Christian
Katz Sandor D.
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