Kl3 semileptonic form factor from 2+1 flavour lattice QCD

Abstract

We present the first results for the Kl3 form factor from simulations with 2+1 flavours of dynamical domain wall quarks. Combining our result, namely f_+(0)=0.964(5), with the latest experimental results for Kl3 decays leads to |V_{us}|=0.2249(14), reducing the uncertaintity in this important parameter. For the O(p^6) term in the chiral expansion we obtain Δf=-0.013(5).

4 pages, 3 figures, 4 tables, matches version appearing in Phys.Rev.Lett