K(l3) form factor with N(f) = 2+1 dynamical domain wall fermions

Abstract

We present the latest results from the UKQCD/RBC collaborations for the Kl3 form factor fromsimulations with 2+1 avours of dynamical domain wall quarks. Simulations are performedon lattices with two different volumes and four values of the light quark mass, allowing for anextrapolation to the chiral limit. The analysis includes a thorough investigation into the sourcesof systematic error in our ts. After interpolating to zero momentum transfer, we obtain f+(0) =0:964(5) (or Df