%0 Journal Article
%T The kaon semileptonic form factor with near physical domain wall quarks
%A Peter A. Boyle
%A Jonathan M. Flynn
%A Nicolas Garron
%A Andreas Juttner
%A Chris T. Sachrajda
%A Karthee Sivalingam
%A James M. Zanotti
%J Physics
%D 2013
%I arXiv
%R 10.1007/JHEP08(2013)132
%X We present a new calculation of the K->pi semileptonic form factor at zero momentum transfer in domain wall lattice QCD with Nf=2+1 dynamical quark flavours. By using partially twisted boundary conditions we simulate directly at the phenomenologically relevant point of zero momentum transfer. We perform a joint analysis for all available ensembles which include three different lattice spacings (a=0.09-0.14fm), large physical volumes (m_pi*L>3.9) and pion masses as low as 171 MeV. The comprehensive set of simulation points allows for a detailed study of systematic effects leading to the prediction f+(0)=0.9670(20)(+18/-46), where the first error is statistical and the second error systematic. The result allows us to extract the CKM-matrix element |Vus|=0.2237(+13/-8) and confirm first-row CKM-unitarity in the Standard Model at the sub per mille level.
%U http://arxiv.org/abs/1305.7217v1