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

doi:10.1103/PhysRevD.81.054507

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

Physics

Research output: Contribution to journal › Article › peer-review

69 Scopus citations

Abstract

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 language	English (US)
Article number	054507
Journal	Physical Review D - Particles, Fields, Gravitation and Cosmology
Volume	81
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevD.81.054507
State	Published - Mar 22 2010

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Physics and Astronomy (miscellaneous)

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title = "Ratio FK/Fπ in QCD",

abstract = "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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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

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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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