Home > Publications database > Leptonic decay-constant ratio $f_K/f_\pi$ from lattice QCD using 2+1 clover-improved fermion flavors with 2-HEX smearing > print

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005     20210129230140.0
024 7 _ |a arXiv:1601.05998
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024 7 _ |a 10.1103/PhysRevD.95.054513
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100 1 _ |a Dürr, Stephan
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245 _ _ |a Leptonic decay-constant ratio $f_K/f_\pi$ from lattice QCD using 2+1 clover-improved fermion flavors with 2-HEX smearing
260 _ _ |a Woodbury, NY
|c 2017
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264 _ 1 |3 online
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|b American Physical Society (APS)
|c 2017-03-31
264 _ 1 |3 print
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|b American Physical Society (APS)
|c 2017-03-01
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520 _ _ |a We present a calculation of the leptonic decay-constant ratio $f_K/f_\pi$ in 2+1 flavor QCD, performed via a series of lattice studies, which allows us to quantify all sources of systematic uncertainty. Our final result is $f_K/f_\pi=1.182(28)$, and with isospin breaking corrections from ChPT the charged decay-constant ratio reads $f_{K^\pm}/f_{\pi^\pm}=1.178(28)$. With $V_\mathrm{ud}$ from super-allowed nuclear beta decays, the CKM matrix element $V_\mathrm{us}=0.2282(54)$ is perfectly compatible with the first-row unitarity constraint of the Standard Model.
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700 1 _ |a Fodor, Zoltán
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700 1 _ |a Hoelbling, Christian
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700 1 _ |a Krieg, Stefan
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700 1 _ |a Lellouch, Laurent
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700 1 _ |a Lippert, Thomas
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700 1 _ |a Rae, Thomas
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700 1 _ |a Schäfer, Andreas
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700 1 _ |a Scholz, Enno E.
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700 1 _ |a Szabo, Kalman
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700 1 _ |a Varnhorst, Lukas
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773 1 8 |a 10.1103/physrevd.95.054513
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773 _ _ |a 10.1103/PhysRevD.95.054513
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