Kl₃ semileptonic form factor from (2+1)-flavor lattice QCD
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Date
2008
Authors
Boyle, P.
Juttner, A.
Kenway, R.
Sachrajda, C.
Sasaki, S.
Soni, A.
Tweedie, R.
Zanotti, J.
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Physical Review Letters, 2008; 100(14):141601:1-141601:4
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P. A. Boyle, A. Jüttner, R. D. Kenway, C. T. Sachrajda, S. Sasaki, A. Soni, R. J. Tweedie, and J. M. Zanotti (RBC+UKQCD Collaborations)
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Abstract
We present the first results for the K(sub)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(sub)l3 decays leads to |V(sub)us|=0.2249(14), reducing the uncertaintity in this important parameter. For the O(p⁶) term in the chiral expansion we obtain Δf=-0.013(5).
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© 2008 The American Physical Society