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arXiv · 0710.5136

Kl3 semileptonic form factor from 2+1 flavour lattice QCD

P. A. Boyle·A. Jüttner·R. D. Kenway·C. T. Sachrajda·S. Sasaki·A. Soni·R. J. Tweedie·J. M. Zanotti
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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).

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P. A. Boyle, A. Jüttner, R. D. Kenway, C. T. Sachrajda, S. Sasaki, A. Soni, R. J. Tweedie, J. M. Zanotti. 2008-12-22. Kl3 semileptonic form factor from 2+1 flavour lattice QCD. https://doi.org/10.1103/physrevlett.100.141601

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