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

Dürr, Stephan, Fodor, Zoltán, Hoelbling, Christian, Krieg, Stefan , Lellouch, Laurent, Lippert, Thomas, Rae, Thomas, Schäfer, Andreas, Scholz, Enno E., Szabó, Kálmán K. and Varnhorst, Lukas (2017) Leptonic decay-constant ratio fK/fπ from lattice QCD using 2+1 clover-improved fermion flavors with 2-HEX smearing. Physical Review D 95 (5).

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Other URL: http://doi.org/10.1103/PhysRevD.95.054513


Abstract

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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Item type:Article
Date:2017
Institutions:UNSPECIFIED
Identification Number:
ValueType
10.1103/PhysRevD.95.054513DOI
Keywords:FINITE-VOLUME; COMPUTATION; MASSES; QUARK;
Dewey Decimal Classification:500 Science > 530 Physics
Status:Published
Refereed:Yes, this version has been refereed
Created at the University of Regensburg:Yes
Item ID:38579
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