Ratio FK/Fπ in QCD

S. Dürr, Z. Fodor, C. Hoelbling, S. D. Katz, S. Krieg, T. Kurth, L. Lellouch, T. Lippert, A. Ramos, K. K. Szabó

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68 Citations (Scopus)


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.

Original languageEnglish
Article number054507
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number5
Publication statusPublished - márc. 22 2010

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

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    Dürr, S., Fodor, Z., Hoelbling, C., Katz, S. D., Krieg, S., Kurth, T., Lellouch, L., Lippert, T., Ramos, A., & Szabó, K. K. (2010). Ratio FK/Fπ in QCD. Physical Review D - Particles, Fields, Gravitation and Cosmology, 81(5), [054507]. https://doi.org/10.1103/PhysRevD.81.054507