Leptonic decay-constant ratio $f_K/f_\pi$ 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 $f_K/f_\pi$ 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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Physical Review D, American Physical Society, 2017, 95 (5), pp.054513. 〈10.1103/PhysRevD.95.054513〉
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https://hal.archives-ouvertes.fr/hal-01304460
Contributeur : Laurent Lellouch <>
Soumis le : mardi 19 avril 2016 - 18:39:58
Dernière modification le : mardi 18 avril 2017 - 15:46:41

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Stephan Dürr, Zoltán Fodor, Christian Hoelbling, Stefan Krieg, Laurent Lellouch, et al.. Leptonic decay-constant ratio $f_K/f_\pi$ from lattice QCD using 2+1 clover-improved fermion flavors with 2-HEX smearing. Physical Review D, American Physical Society, 2017, 95 (5), pp.054513. 〈10.1103/PhysRevD.95.054513〉. 〈hal-01304460〉

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