TY  - CONF
AU  - Scholz, Enno E.
AU  - Durr, Stephan
TI  - Leptonic decay-constant ratio $f_K/f_\pi$ from clover-improved $N_f=2+1$ QCD
PB  - Proceedings of Science
M1  - FZJ-2016-08011
SP  - 283
PY  - 2016
N1  - PoS(LATTICE 2016)283
AB  - The 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 $V_{\rm us}$.
T2  - 34th International Symposium on Lattice Field Theory
CY  - 25 Jul 2016 - 30 Jul 2016, Southampton (UK)
Y2  - 25 Jul 2016 - 30 Jul 2016
M2  - Southampton, UK
LB  - PUB:(DE-HGF)8
UR  - https://juser.fz-juelich.de/record/825550
ER  -