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000825550 0247_ $$2arXiv$$aarXiv:1610.00932
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000825550 037__ $$aFZJ-2016-08011
000825550 1001_ $$0P:(DE-HGF)0$$aScholz, Enno E.$$b0$$eCorresponding author
000825550 1112_ $$a34th International Symposium on Lattice Field Theory$$cSouthampton$$d2016-07-25 - 2016-07-30$$gLATTICE2016$$wUK
000825550 245__ $$aLeptonic decay-constant ratio $f_K/f_\pi$ from clover-improved $N_f=2+1$ QCD
000825550 260__ $$bProceedings of Science$$c2016
000825550 300__ $$a283
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000825550 500__ $$aPoS(LATTICE 2016)283
000825550 520__ $$aThe leptonic decay-constant ratio $f_K/f_\pi$ is calculated from lattice-QCD simulations using $N_f=2+1$ dynamical fermion flavors in the clover-improved formulation and 2-HEX smearing. The simulations were performed for a range of mass-degenerate light quarks including the physical point and at various lattice couplings and volumes, allowing to quantify all relevant sources of systematic uncertainties for our final number of the decay-constant ratio. Utilizing input from chiral perturbation theory, we also quote the charged decay-constant ratio $f_{K^\pm}/f_{\pi^\pm}$. With further input from super-allowed nuclear $\beta$-decays, eventually we obtain an estimate for the CKM-matrix element $V_{\rm us}$.
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000825550 7001_ $$0P:(DE-Juel1)132580$$aDurr, Stephan$$b1$$eCorresponding author
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