Kaon semileptonic decays with $N_f=2+1+1$ HISQ fermions and physical light-quark masses
| Autor: | Gamiz, E., Bazavov, A., Bernard, C., DeTar, C., Du, D., El-Khadra, A. X., Freeland, E. D., Gottlieb, Steven, Heller, U. M., Komijani, J., Kronfeld, A. S., Laiho, J., Mackenzie, P. B., Neil, E. T., Primer, T., Simone, J. N., Sugar, R., Toussaint, D., Van de Water, R. S., Zhou, Ran |
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| Rok vydání: | 2016 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | 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 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 $\vert V_{us}\vert$. Comment: 7 pages, 2 figures, to appear in the Proceedings of Lattice 2016, The 34th International Symposium on Lattice Field Theory, held 24-30 July 2016, at the University of Southampton, UK. v2: references corrected |
| Databáze: | arXiv |
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