Photoproduction of nucleon resonances and nucleon spin structure function in the resonance region

Qin, Di; Schmidt, Iván

doi:10.1103/physrevc.65.015202

Cited by 4 publications

(1 citation statement)

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“…An interesting variation on the effective Lagrangian approach involves the use of an effective Lagrangian for a quark-pseudoscalar-meson coupling in a constituent quark model [20][21][22][23]. The quark-model wave functions for the nucleon and the baryon resonances provide a form factor for each interaction vertex, and the s-and u-channel resonances can be consistently included in calculating the meson production amplitudes.…”

Section: Introductionmentioning

confidence: 99%

Photoproduction of mesons from the nucleon

Fuda

Alharbi

2003

Phys. Rev. C

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A general formalism is established for constructing models for the photoproduction of mesons from the nucleon. The essential ingredient is a mass operator which describes the coupling between meson-baryon, photon-baryon, and single-baryon channels. The most general forms for the mass operator interactions which produce these couplings are derived. These forms also provide generalizations of the Chew-Goldberger-Low-Nambu amplitudes for pion-nucleon photoproduction to any meson-baryon final state. The models lead to S-matrix elements that transform properly under inhomogeneous Lorentz transformations and are gauge invariant. The photoproduction amplitudes include final state interactions and satisfy Watson's theorem. A specific model is constructed by deriving the mass operator interactions from effective Lagrangians that describe the couplings of mesons, photons, and baryons. The electromagnetic interactions include direct and crossed nucleon contributions, as well as direct contributions from the P 33 ͑1232͒, P 11 ͑1440͒, D 13 ͑1520͒, and S 11 ͑1535͒ resonances. A contact term and exchange terms due to the , , and mesons are also included. The model gives a good fit to the significant multipoles in the energy range from the single-pion, photoproduction threshold up to a center-of-momentum energy of W=1550 MeV, which corresponds to a photon lab energy of 810 MeV.

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Section: Introductionmentioning

confidence: 99%