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

doi:10.1103/PhysRevLett.100.141601

Kl3 semileptonic form factor from 2+1 flavour lattice QCD

High Energy Physics - Lattice 2008-12-22 v2 High Energy Physics - Phenomenology

Authors: 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 \Delta f=-0.013(5).

Keywords

kl3 form factor lattice qcd domain wall quarks ckm matrix element chiral expansion semileptonic decays

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@article{arxiv.0710.5136,
  title  = {Kl3 semileptonic form factor from 2+1 flavour lattice QCD},
  author = {P. A. Boyle and A. Jüttner and R. D. Kenway and C. T. Sachrajda and S. Sasaki and A. Soni and R. J. Tweedie and J. M. Zanotti},
  journal= {arXiv preprint arXiv:0710.5136},
  year   = {2008}
}

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

Kl3 semileptonic form factor from 2+1 flavour lattice QCD

Abstract

Keywords

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