We present the latest results from the UKQCD/RBC collaborations for the K_l3 form factor with 2+1 flavours of dynamical domain wall quarks. Simulations are performed on 16^3x32x16 and 24^3x64x16 lattices with three values of the light quark mass, allowing for an extrapolation to the chiral limit. After interpolating to zero momentum transfer, we obtain the preliminary result f_+^{K\pi}(0)=0.9609(51) (or \Delta f = -0.0161(51)), which is in agreement with the result of Leutwyler & Roos.
@article{arxiv.hep-lat/0702026,
title = {K_l3 form factor with N_f=2+1 dynamical domain wall fermions: A progress report},
author = {D. J. Antonio and P. A. Boyle and C. Dawson and T. Izubuchi and A. Jüttner and C. Sachrajda and S. Sasaki and A. Soni and R. J. Tweedie and J. M. Zanotti},
journal= {arXiv preprint arXiv:hep-lat/0702026},
year = {2007}
}
Comments
4 pages, 4 figures. Talk presented at CKM2006, Nagoya, Japan