Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1994-09-22
Physics
High Energy Physics
High Energy Physics - Phenomenology
19 pp, TeX, Invited lecture, Summer School on "Hadronic Aspects of Collider Physics", Zuoz, Switzerland, August 1994. 3 figs.
Scientific paper
I consider some selected topics in chiral perturbation theory (CHPT) as probed at colliders such as DA$\Phi$NE. Emphasis is put on processes involving pions in the isospin zero S-wave which require multi-loop calculations. These include the scalar form factor of the pion, two--photon fusion into pion pairs and $K_{\ell 4}$--decays. The physics of the chiral anomaly is briefly touched upon
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