Recent developments in chiral perturbation theory

Details Recent developments in chiral perturbation theory Recent developments in chiral perturbation theory

2000-11-02

arxiv.org/abs/hep-ph/0011025v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

Latex 12 pages, Invited plenary talk at "Confinement IV", 4-8 July, Vienna

Scientific paper

I briefly review the current status of chiral perturbation theory in the meson sector. Emphasis is given on the quest for higher precision. I discuss two examples: one where it is difficult to make a good prediction (K_L -> pi^0 gamma gamma), and where CHPT, even when pushed to higher orders, cannot yield an increase in accuracy. The second one is pi pi scattering where a very sharp prediction can be made by combining CHPT at the two-loop level with dispersion relations

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