Analysis of the DeltaI=1/2 Rule and e'/e with Overlap Fermions

Details Analysis of the DeltaI=1/2 Rule and e'/e with Overlap Fermions Analysis of the DeltaI=1/2 Rule and e'/e with Overlap Fermions

2000-11-16

arxiv.org/abs/hep-lat/0011070v2

Phys.Rev. D64 (2001) 014506

Physics

High Energy Physics

High Energy Physics - Lattice

Latex, 19 pages, minor changes, to appear on Phys. Rev. D

Scientific paper

10.1103/PhysRevD.64.014506

We study the renormalization of the DeltaS=1 effective weak Hamiltonian with overlap fermions. The mixing coefficients among dimension-six operators are computed at one loop in perturbation theory. As a consequence of the chiral symmetry at finite lattice spacing and of the GIM mechanism, which turns out to be quadratic in the masses, the K-->pi pi and K -->pi matrix elements relevant for the Delta I =1/2 rule can be computed without any power subtractions. The analogous amplitudes for e'/e require one divergent subtraction only, which can be performed non-perturbatively using K-->0 matrix elements.

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