Effective Lagrangian approach to the ω photoproduction near threshold

Alexander I. Titov and T.-S. H. Lee
Phys. Rev. C 66, 015204 – Published 17 July 2002
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Abstract

We apply the effective Lagrangian approach to investigate the role of the nucleon resonances in ω-meson photoproduction at energies near the threshold. The nonresonant amplitudes are taken from the previous investigations at higher energies and consist of the pseudoscalar meson exchange and the nucleon Born terms. The resonant amplitudes are calculated from effective Lagrangians with the N*γN and N*ωN coupling constants fixed by the empirical helicity amplitudes and the vector meson dominance model. The contributions from the nucleon resonances are found to be significant in changing the differential cross sections in a wide interval of t and various spin observables. In particular, we suggest that a crucial test of our predictions can be made by measuring single and double spin asymmetries.

  • Received 6 March 2002

DOI:https://doi.org/10.1103/PhysRevC.66.015204

©2002 American Physical Society

Authors & Affiliations

Alexander I. Titov*

  • Advanced Science Research Center, JAERI, Tokai, Ibaraki, 319-1195 Japan

T.-S. H. Lee

  • Physics Division, Argonne National Laboratory, Argonne, Illinois 60439

  • *Present address: Bogoliubov Laboratory of Theoretical Physics, JINR, Dubna 141980, Russia. Electronic address: atitov@thsun1.jinr.ru
  • Electronic address: lee@theory.phy.anl.gov

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Vol. 66, Iss. 1 — July 2002

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