Neutral pion photoproduction on the nucleon near threshold

Phys. Rev. C 41, 213 – Published 1 January 1990
S. Nozawa, T.-S. H. Lee, and B. Blankleider

Abstract

Neutral pion photoproduction on the nucleon near threshold is investigated using a dynamical model. Analytic properties of the final-state interaction amplitude in the energy region near π+n production threshold are examined in detail. It is shown that the commonly used procedure, based on an analytical continuation of the K matrix to the unphysical region, is not compatible to an approach incorporating full off-energy-shell dynamics. Our calculation indicates that the final-state interaction amplitude derived from a dynamical model could involve large cancellation between the different pion photoproduction mechanisms. This leads to the surprising result that the final-state interaction effect due to the intermediate π0p state can be as important as that due to the π+n intermediate state. At threshold, we obtain &. This number is close to the measured value of &. No violation of the low-energy theorem is required to obtain good agreement between the calculated total cross sections and experimental data from threshold to about 400-MeV incident photon energy.

DOI: http://dx.doi.org/10.1103/PhysRevC.41.213

  • Received 4 August 1989
  • Published in the issue dated January 1990

© 1990 The American Physical Society

Authors & Affiliations

S. Nozawa

  • TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, Canada V6T 2A3

T.-S. H. Lee

  • Argonne National Laboratory, Argonne, Illinois 60439
  • TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, Canada V6T 2A3

B. Blankleider

  • Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland

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