Kaon semileptonic decays with $N_f=2+1+1$ HISQ fermions and physical light-quark masses

E. Gamiz, A. Bazavov, C. Bernard +17

We discuss the reduction of errors in the calculation of the form factor $f_{+}^{K\pi }(0)$ with HISQ fermions on the $N_f=2+1+1$ MILC configurations from increased statistics on some…