Neutral pion photoproduction off nucléons revisited

V. Bernard, N. Kaiser, Ulf G. Meisner

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123 Scopus citations


We investigate threshold pion photoproduction in the framework of heavy baryon chiral perturbation theory. We give the expansion of the electric dipole amplitude E0+ to three orders in //, the ratio of the pion to nucléon 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 yn -> n°n.

Original languageEnglish
Pages (from-to)483-497
Number of pages15
JournalZeitschrift für Physik C Particles and Fields
Issue number3
StatePublished - 1996
Externally publishedYes


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