Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2004-11-12
Eur.Phys.J. A24S1 (2005) 69-73
Physics
High Energy Physics
High Energy Physics - Lattice
17 pages, 8 figures. Based on talks given at: DAFNE 2004: Physics at meson factories, Laboratori Nazionali di Frascati (Italy)
Scientific paper
10.1140/epjad/s2005-05-012-0
We discuss the result of a recent quenched lattice calculation of the K -> pi vector form factor at zero-momentum transfer, relevant for the determination of |V_us| from K-> pi l nu decays. Using suitable double ratios of three-point correlation functions, we show that it is possible to calculate this quantity at the percent-level precision. The leading quenched effects are corrected for by means of quenched chiral perturbation theory. The final result, f+(0) = 0.960 +- 0.005_stat +- 0.007_syst, turns out to be in good agreement with the old quark model estimate made by Leutwyler and Roos. In this paper, we discuss the phenomenological impact of the lattice result for the extraction of |V_us|, by updating the analysis of K -> pi l nu decays with the most recent experimental data. We also present a preliminary lattice study of hyperon Sigma -> n l nu decays, based on a similar strategy.
Becirevic Damir
Guadagnoli Diego
Isidori Gino
Lubicz Vittorio
Martinelli Gabriele
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