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arxiv: 1601.05998 · v2 · pith:3FPZQP55new · submitted 2016-01-22 · ✦ hep-lat · hep-ph

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

Stephan D\"urr , Zolt\'an Fodor , Christian Hoelbling , Stefan Krieg , Laurent Lellouch , Thomas Lippert , Thomas Rae , Andreas Sch\"afer
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Enno E. Scholz K\'alm\'an K. Szab\'o Lukas Varnhorst
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classification ✦ hep-lat hep-ph
keywords decay-constantlatticeleptonicratiobelowcalculationcarefulclover-improved
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We present a calculation of the leptonic decay-constant ratio $f_K/f_\pi$ 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.

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