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- W2950300087 abstract "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 $gamma n to pi^0 n$." @default.
- W2950300087 created "2019-06-27" @default.
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- W2950300087 date "1994-11-14" @default.
- W2950300087 modified "2023-09-27" @default.
- W2950300087 title "Neutral pion photoproduction off nucleons revisited" @default.
- W2950300087 doi "https://doi.org/10.48550/arxiv.hep-ph/9411287" @default.
- W2950300087 hasPublicationYear "1994" @default.
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