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arxiv: 1112.5259 · v1 · pith:MNMEJ3FJnew · submitted 2011-12-22 · ✦ hep-lat · hep-ph

Kaon semileptonic form factors in QCD with exact chiral symmetry

classification ✦ hep-lat hep-ph
keywords factorsformchiralchptkaonlatticequarksemileptonic
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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.

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