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Neutral pion photoproduction off nucleons revisited

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Zeitschrift für Physik C Particles and Fields

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 μ 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 γ n → π0 n.

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Authors and Affiliations

  1. Centre de Recherches Nucleaires, Physique Theorique, Bat. 40, BP 28, F-67037, Strasbourg Cedex 2, France

    V. Bernard

  2. Laboratoire de Physique Theorique, Institut de Physique 3-5 rue de l’Universite, F-67084, Strasbourg Cedex, France

    V. Bernard

  3. Physik Department T39, Technische Universität München, James Franck Straße, D-85747, Garching, Germany

    N. Kaiser

  4. Institut für Theoretische Kernphysik, Universität Bonn, Nussallee 1416, D-53115, Bonn, Germany

    Ulf G. Meißner

Authors
  1. V. Bernard
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  2. N. Kaiser
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  3. Ulf G. Meißner
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Correspondence to V. Bernard.

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Bernard, V., Kaiser, N. & Meißner, U.G. Neutral pion photoproduction off nucleons revisited. Z Phys C - Particles and Fields 70, 483–497 (1996). https://doi.org/10.1007/s002880050126

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  • DOI: https://doi.org/10.1007/s002880050126

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