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

Stephan Dürr, Zoltán Fodor, Christian Hoelbling +8

We present a calculation of the leptonic decay-constant ratio $f_K/f_{\pi }$ in 2+1 flavor QCD. Our data set includes five lattice spacings and pion masses reaching down below the physi…