TY - JOUR
T1 - Ratio FK/Fπ in QCD
AU - Dürr, S.
AU - Fodor, Z.
AU - Hoelbling, C.
AU - Katz, S. D.
AU - Krieg, S.
AU - Kurth, T.
AU - Lellouch, L.
AU - Lippert, T.
AU - Ramos, A.
AU - Szabó, K. K.
PY - 2010/3/22
Y1 - 2010/3/22
N2 - We determine the ratio FK/Fπ 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/Fπ=1.192(7)stat(6)syst. This result is then used to give an updated value of the Cabibbo-Kobayashi-Maskawa) matrix element |Vus|. The unitarity relation for the first row of this matrix is found to be well observed.
AB - We determine the ratio FK/Fπ 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/Fπ=1.192(7)stat(6)syst. This result is then used to give an updated value of the Cabibbo-Kobayashi-Maskawa) matrix element |Vus|. The unitarity relation for the first row of this matrix is found to be well observed.
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U2 - 10.1103/PhysRevD.81.054507
DO - 10.1103/PhysRevD.81.054507
M3 - Article
AN - SCOPUS:77950556904
SN - 1550-7998
VL - 81
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
IS - 5
M1 - 054507
ER -