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Johan Bijnens, Alejandro Celis
K -> pi pi Decays in SU(2) Chiral Perturbation Theory
Abstract
We study the decays $K\to\pi\pi$ in one-loop two-flavour Chiral
Perturbation Theory. We provide arguments why the calculation of the
coefficient of the pionic chiral logarithm $\logm = M^2\log M^2$ is unique
and then perform the calculation. As a check we perform the reduction of
the known three-flavour result. The underlying arguments are expected to be
valid for heavier particles and other processes as well.
LU TP 09-14
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