We report on our calculation of the kaon semileptonic form factors in Nf=2+1 lattice QCD. Chiral symmetry is exactly preserved by using the overlap quark action for a straightforward comparison with chiral perturbation theory (ChPT). We simulate three pion masses down to 290 MeV at a single lattice spacing of 0.11 fm and at a strange quark mass very close to its physical value. The form factors near zero momentum transfer are precisely calculated by using the all-to-all propagator and twisted boundary conditions. We compare the normalizations and slopes of the form factors with ChPT and experiments.
@article{arxiv.1112.5259,
title = {Kaon semileptonic form factors in QCD with exact chiral symmetry},
author = {JLQCD Collaboration and T. Kaneko and S. Aoki and G. Cossu and X. Feng and H. Fukaya and S. Hashimoto and J. Noaki and T. Onogi},
journal= {arXiv preprint arXiv:1112.5259},
year = {2011}
}
Comments
7 pages, talk presented at the XXIX International Symposium on Lattice Field Theory (Lattice 2011), Squaw Valley, Lake Tahoe, California, July 10-16, 2011