Kl3 semileptonic form factor from (2+1)-flavor lattice QCD

RBC UKQCD Collaborations, Peter Boyle, A. Juettner, Richard 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 K-l3 form factor from simulations with 2+1 flavors of dynamical domain wall quarks. Combining our result, namely, f(+)(0)=0.964(5) with the latest experimental results for K-l3 decays leads to vertical bar V-us vertical bar=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).

Original languageEnglish
Article number141601
Number of pages4
JournalPhysical Review Letters
Volume100
Issue number14
DOIs
Publication statusPublished - 11 Apr 2008

Keywords

  • CHIRAL FERMIONS
  • DECAYS

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