PHOTOMESON PRODUCTION IN INTERMEDIATE COUPLING
Journal Article
·
· Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D
ABS>The wave functions for the ground state of a physical nucleon and for the scattering state of a physical nucleon and a pion are used to compute photopion production cross sections in an intermediate-coupling approximation. Since the mesons included in the physical nucleon suffice to account for an approximately correct value of the anomnalous magnetic moment, no use is made in this theory of a correction term involving experimental values of the latter. The p-wave part of the photoproduction matrix element is arrived at naturally, largely from the interaction of the meson currents with thc electromagetic field. Differential cross sections are obtanined for the production of pi /sup +/ and pi /sup o/ by photons of 200, 260, 335, and 440 Mev in the laboratory system. It is also pointed oat that in the intermediate-coupling theory, the ambiguity in defining a gauge-invariant Hamiltonian is nontrivial. Different procedures for generalizing the meson-nucleon interaction term into a form that is gauge invariant in an extended-source theory lead to substantially different p-wave components of the photoproduction cross sections. (auth)
- Research Organization:
- Columbia Univ., New York
- NSA Number:
- NSA-13-001564
- OSTI ID:
- 4326454
- Journal Information:
- Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 111; ISSN PHRVA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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