Ratio F[subscript K]/F[subscript pi] in QCD

Author(s)
Krieg, Stefan F.; Dürr, S.; Fodor, Z.; Hoelbling, C.; Katz, S. D.; ... Show more
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Alternative title
Ratio FK/Fπ in QCD
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Abstract
We determine the ratio F[subscript K]/F[subscript pi] in QCD with N[subscript 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[subscript K]/F[subscript pi]=1.192(7)[subscript stat](6)[subscript syst]. This result is then used to give an updated value of the Cabibbo-Kobayashi-Maskawa) matrix element |V[subscript us]|. The unitarity relation for the first row of this matrix is found to be well observed.
Date issued
2010-03
URI
http://hdl.handle.net/1721.1/58694
Department
Massachusetts Institute of Technology. Center for Theoretical Physics
Journal
Physical Review D
Publisher
American Physical Society
Citation
Dürr, S. et al. “Ratio F[subscript K]/F[subscript pi] in QCD.” Physical Review D 81.5 (2010): 054507. © 2010 The American Physical Society.
Version: Final published version
ISSN
1550-7998
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