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

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Dürr, Stephan ; Fodor, Zoltán ; Hoelbling, Christian ; Krieg, Stefan ; Lellouch, Laurent ; Lippert, Thomas ; Rae, Thomas ; Schäfer, Andreas ; Scholz, Enno E. ; Szabó, Kálmán K. ; Varnhorst, Lukas
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Date of publication of this fulltext: 20 Mar 2019 12:43


We present a calculation of the leptonic decay-constant ratio f(kappa)/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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