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

Gamiz, Elvira; Bazavov, Alexei; Bernard, Claude; DeTar, Carleton; Du, Daping; El-Khadra, Aida X; Freeland, Elizabeth; Gottlieb, Steven; Heller, Urs M.; Komijani, Javad; Kronfeld, Andreas; Laiho, John; Mackenzie, Paul B.; Neil, Ethan T; Primer, Thomas; Simone, James N.; Sugar, Robert; Toussaint, Doug; Van de Water, Ruth; Zhou, Ran; Fermilab Lattice and MILC Collaborations,

doi:10.22323/1.256.0286

Volume 256 - 34th annual International Symposium on Lattice Field Theory (LATTICE2016) - Weak Decay and Matrix Elements

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

E. Gamiz*, A. Bazavov, C. Bernard, C. DeTar, D. Du, A.X. El-Khadra, E. Freeland, S. Gottlieb, U.M. Heller, J. Komijani, A. Kronfeld, J. Laiho, P.B. Mackenzie, E.T. Neil, T. Primer, J.N. Simone, R. Sugar, D. Toussaint, R. Van de Water, R. Zhou and Fermilab Lattice and MILC Collaborations

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Pre-published on: December 27, 2016

Published on: March 24, 2017

Abstract

We discuss the reduction of errors in the calculation of vector the form factor for semileptonic kaon decays with HISQ fermions on the N_f=2+1+1 MILC configurations from increased statistics on some key ensembles, new data on ensembles with lattice spacings down to 0.042fm 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 |V_{us}|.

DOI: https://doi.org/10.22323/1.256.0286

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