LU TP 99-33, hep-ph/9910415
Models of Low Energy Effective Theory applied to Kaon
Non-leptonic Decays and Other Matrix Elements
J. Bijnens
In this talk I describe work on computing non-leptonic matrix elements
consistently with both long and short distance contributions included.
On the simpler example of the $\pi^+$-$\pi^0$ mass difference I explain
in detail the matching procedure and the difference between various
low-energy models. I then explain the new difficulties in non-leptonic
Kaon decays and how the matching here can in principle be done in the
same way when scheme dependences are correctly accounted for. In the end
I summarize the results J. Prades and I obtain for the $\Delta I=1/2$ rule
and $B_6$.
to appear in the International Workshop on Hadron Physics
`Effective Theories of Low Energy QCD',
Coimbra, Portugal, September 10-15, 1999