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 |Vus|=0.2249(14), reducing the uncertaintity in this important parameter. For the O(p6) term in the chiral expansion we obtain f=-0.013(5).
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