Kl3 semileptonic form factor from 2+1 flavour lattice QCD

Details Kl3 semileptonic form factor from 2+1 flavour lattice QCD Kl3 semileptonic form factor from 2+1 flavour lattice QCD

2007-10-26

arxiv.org/abs/0710.5136v2

Phys.Rev.Lett.100:141601,2008

Physics

High Energy Physics

High Energy Physics - Lattice

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

Scientific paper

10.1103/PhysRevLett.100.141601

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 \Delta f=-0.013(5).

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