Leptonic decay-constant ratio fK /fπ from lattice QCD using 2+1 clover-improved fermion flavors with 2-HEX smearing

Stephan Dürr, Zoltán Fodor, Christian Hoelbling, Stefan Krieg, Laurent Lellouch, Thomas Lippert, Thomas Rae, Andreas Schäfer, Enno E. Scholz, Kálmán K. Szabó, Lukas Varnhorst

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7 Scopus citations

Abstract

We present a calculation of the leptonic decay-constant ratio fK/fπ in 2+1 flavor QCD. Our data set includes five lattice spacings and pion masses reaching down below the physical one. Special emphasis is placed on a careful study of all systematic uncertainties, especially the continuum extrapolation. Our result is perfectly compatible with the first-row unitarity constraint of the Standard Model.

Original languageEnglish (US)
Article number054513
JournalPhysical Review D
Volume95
Issue number5
DOIs
StatePublished - Mar 2017

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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