FK/Fpi from the Budapest-Marseille-Wuppertal Collaboration

Details FK/Fpi from the Budapest-Marseille-Wuppertal Collaboration FK/Fpi from the Budapest-Marseille-Wuppertal Collaboration

2011-01-20

arxiv.org/abs/1101.3968v1

Physics

High Energy Physics

High Energy Physics - Lattice

6 pages, 2 figures. Proceedings of CKM2010, the 6th International Workshop on the CKM Unitarity Triangle, University of Warwic

Scientific paper

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.

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