Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-12-22
Eur.Phys.J. A28 (2006) 59-70
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages, 13 figures, invited talk given at the Symposium 20 Years of Physics at the Mainz Microtron MAMI, 20 - 22 October 200
Scientific paper
Chiral perturbation theory is the effective field theory of the strong interactions at low energies. We will give a short introduction to chiral perturbation theory for mesons and will discuss, as an example, the electromagnetic polarizabilities of the pion. These have recently been extracted from an experiment on radiative $\pi^+$ photoproduction from the proton ($\gamma p\to \gamma \pi^+ n$) at the Mainz Microtron MAMI. Next we will turn to the one-baryon sector of chiral perturbation theory and will address the issue of a consistent power counting scheme. As examples of the heavy-baryon framework we will comment on the extraction of the axial radius from pion electroproduction and will discuss the generalized polarizabilities of the proton. Finally, we will discuss two recently proposed manifestly Lorentz-invariant renormalization schemes and illustrate their application in a calculation of the nucleon electromagnetic form factors.
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