Ratio of kaon and pion leptonic decay constants with $N_f=2+1+1$ Wilson-clover twisted-mass fermions

C. Alexandrou, S. Bacchio, G. Bergner +12

We present a determination of the ratio of kaon and pion leptonic decay constants in isosymmetric QCD (isoQCD), $f_K/f_{\pi }$, making use of the gauge ensembles produced by the Exten…