We discuss the reduction of errors in the calculation of the form factor f + Kπ (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|.
|Original language||English (US)|
|Journal||Proceedings of Science|
|State||Published - 2016|
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