arxiv: 0710.5136 · v2 · submitted 2007-10-26 · ✦ hep-lat · hep-ph

Kl3 semileptonic form factor from 2+1 flavour lattice QCD

P.A. Boyle , A. J\"uttner , R.D. Kenway , C.T. Sachrajda , S. Sasaki , A. Soni , R.J. Tweedie , J.M. Zanotti This is my paper

classification ✦ hep-lat hep-ph

keywords factorformresultschiralcombiningdecaysdeltadomain

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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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Kl3 semileptonic form factor from 2+1 flavour lattice QCD

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