Chiral perturbation theory for K+ to pi+ pi0 decay in the continuum and on the lattice

Details Chiral perturbation theory for K+ to pi+ pi0 decay in the continuum and on the lattice Chiral perturbation theory for K+ to pi+ pi0 decay in the continuum and on the lattice

1997-10-03

arxiv.org/abs/hep-lat/9710022v1

Nucl.Phys.Proc.Suppl. 63 (1998) 296-298

Physics

High Energy Physics

High Energy Physics - Lattice

Talk presented by Ka Chun Leung at International Symposium on Lattice Field Theories (Lattice 97), Edinburgh, July 1997, 3 pag

Scientific paper

10.1016/S0920-5632(97)00751-2

We use one-loop chiral perturbation theory (ChPT) to compare lattice results for the K+ to pi+ pi0 decay amplitude with the experimental value. Three systematic effects: quenching, finite-volume effects, and the use of unphysical values of quark masses and pion external momenta can be investigated. We find that the corrections help in explaining the discrepancy between lattice and experimental results. We also discuss the relation to B_K.

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