Kaon semileptonic decays with Nf=2+1+1 HISQ fermions and physical light-quark masses
Abstract
We discuss the reduction of errors in the calculation of the form factor f+K π(0) with HISQ fermions on the Nf=2+1+1 MILC configurations from increased statistics on some key ensembles, new data on ensembles with lattice spacings down to 0.042 fm and the study of finite-volume effects within staggered ChPT. We also study the implications for the unitarity of the CKM matrix in the first row and for current tensions with leptonic determinations of Vus.
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