Leptonic decay-constant ratio $f_K/f_\pi$ from lattice QCD using 2+1 clover-improved fermion flavors with 2-HEX smearing - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Physical Review D Année : 2017

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

Résumé

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.
Fichier principal
Vignette du fichier
PhysRevD.95.054513.pdf (406.74 Ko) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte
Loading...

Dates et versions

hal-01304460 , version 1 (04-05-2018)

Identifiants

Citer

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, 2017, 95 (5), pp.054513. ⟨10.1103/PhysRevD.95.054513⟩. ⟨hal-01304460⟩
381 Consultations
71 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More