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000828743 1001_ $$0P:(DE-Juel1)132580$$aDürr, Stephan$$b0$$eCorresponding author
000828743 245__ $$aLeptonic decay-constant ratio $f_K/f_\pi$ from lattice QCD using 2+1 clover-improved fermion flavors with 2-HEX smearing
000828743 260__ $$aWoodbury, NY$$bInst.$$c2017
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000828743 520__ $$aWe present a calculation of the leptonic decay-constant ratio $f_K/f_\pi$ in 2+1 flavor QCD, performed via a series of lattice studies, which allows us to quantify all sources of systematic uncertainty. Our final result is $f_K/f_\pi=1.182(28)$, and with isospin breaking corrections from ChPT the charged decay-constant ratio reads $f_{K^\pm}/f_{\pi^\pm}=1.178(28)$. With $V_\mathrm{ud}$ from super-allowed nuclear beta decays, the CKM matrix element $V_\mathrm{us}=0.2282(54)$ is perfectly compatible with the first-row unitarity constraint of the Standard Model.
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000828743 7001_ $$0P:(DE-HGF)0$$aFodor, Zoltán$$b1
000828743 7001_ $$0P:(DE-HGF)0$$aHoelbling, Christian$$b2
000828743 7001_ $$0P:(DE-Juel1)132171$$aKrieg, Stefan$$b3
000828743 7001_ $$0P:(DE-HGF)0$$aLellouch, Laurent$$b4
000828743 7001_ $$0P:(DE-Juel1)132179$$aLippert, Thomas$$b5
000828743 7001_ $$0P:(DE-HGF)0$$aRae, Thomas$$b6
000828743 7001_ $$0P:(DE-HGF)0$$aSchäfer, Andreas$$b7
000828743 7001_ $$0P:(DE-HGF)0$$aScholz, Enno E.$$b8
000828743 7001_ $$0P:(DE-Juel1)161563$$aSzabo, Kalman$$b9
000828743 7001_ $$0P:(DE-HGF)0$$aVarnhorst, Lukas$$b10
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