arXiv:0710.5136·v2·High Energy Physics — Lattice
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🇬🇧
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).
Comments: 4 pages, 3 figures, 4 tables, matches version appearing in Phys.Rev.Lett