Based on a series of lattice calculations we determine the ratio FK/Fpi in QCD. With experimental data from kaon decay and nuclear double beta decay, we obtain a precise determination of |Vus|. Our simulation includes 2+1 flavours of sea quarks, with three lattice spacings, large volumes and a simulated pion mass reaching down to about 190 MeV for a full control over the systematic uncertainties.
@article{arxiv.1101.3968,
title = {FK/Fpi from the Budapest-Marseille-Wuppertal Collaboration},
author = {A. Ramos and S. Durr and Z. Fodor and C. Hoelbling and S. D. Katz and S. Krieg and T. Kurth and L. Lellouch and T. Lippert and K. K. Szabo},
journal= {arXiv preprint arXiv:1101.3968},
year = {2015}
}
Comments
6 pages, 2 figures. Proceedings of CKM2010, the 6th International Workshop on the CKM Unitarity Triangle, University of Warwick, UK, 6-10 September 2010