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)=0.9680(16), which is in excellent agreement with an earlier N_f=2 result.
Categories: hep-lat