Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1994-11-14
Z.Phys. C70 (1996) 483-498
Physics
High Energy Physics
High Energy Physics - Phenomenology
27 pp, plain TeX file, 9 figures (available via fax or hard copy from the authors)
Scientific paper
We investigate threshold pion photoproduction in the framework of heavy baryon chiral perturbation theory. We give the expansion of the electric dipole amplitude $E_{0+}$ to three orders in $\mu$, the ratio of the pion to nucleon mass, and show that it is slowly converging. We argue that this observable is not a good testing ground for the chiral dynamics of QCD. In contrast, we exhibit new and fastly converging low--energy theorems in the P--waves which should be used to constrain the data analysis. We also discuss the importance of polarization observables to accurately pin down certain multipoles and give predictions for the reaction $\gamma n \to \pi^0 n$.
Bernard Véronique
Kaiser Nicholas
Meißner Ulf-G.
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