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

doi:10.1103/PhysRevD.95.054513

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

Physics

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14 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 language	English (US)
Article number	054513
Journal	Physical Review D
Volume	95
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevD.95.054513
State	Published - Mar 2017

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics

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10.1103/PhysRevD.95.054513

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

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.",

author = "Stephan D{\"u}rr and Zolt{\'a}n Fodor and Christian Hoelbling and Stefan Krieg and Laurent Lellouch and Thomas Lippert and Thomas Rae and Andreas Sch{\"a}fer and Scholz, {Enno E.} and Szab{\'o}, {K{\'a}lm{\'a}n K.} and Lukas Varnhorst",

note = "Publisher Copyright: {\textcopyright} 2017 American Physical Society.",

year = "2017",

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doi = "10.1103/PhysRevD.95.054513",

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AU - Dürr, Stephan

AU - Fodor, Zoltán

AU - Hoelbling, Christian

AU - Krieg, Stefan

AU - Lellouch, Laurent

AU - Lippert, Thomas

AU - Rae, Thomas

AU - Schäfer, Andreas

AU - Scholz, Enno E.

AU - Szabó, Kálmán K.

AU - Varnhorst, Lukas

PY - 2017/3

Y1 - 2017/3

N2 - 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.

AB - 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.

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U2 - 10.1103/PhysRevD.95.054513

DO - 10.1103/PhysRevD.95.054513

M3 - Article

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VL - 95

JO - Physical Review D

JF - Physical Review D

IS - 5

M1 - 054513

ER -

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

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