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AbstractAbstract
[en] An elementary phenomenological extension of the gauge invariance constrained dynamical amplitudes for γN → π/sup +-/Δ is considered. The extended amplitudes are parameterized with a real MPE background term and simple Regge pole forms. The two free parameters which both appear in the unnatural parity exchange component are determined by comparison with dsigma''/dt data for γp → π-Δ++. The remainder of the natural parity exchange is represented by rho- and A2- exchange. Predictions are made for dsigma/dt and Σ, for the various charge states and the unnatural parity exchange components are well described in each case
Original Title
Gauge invariance, scattering amplitudes, differential cross sections, unnatural parity exchange
Primary Subject
Source
1977; 22 p; Available from NTIS., PC A02/MF A01
Record Type
Report
Report Number
Country of publication
A2-1310 RESONANCES, ASYMMETRY, CROSS SECTIONS, DELTA-1236 RESONANCES, DIFFERENTIAL CROSS SECTIONS, ELECTRIC CHARGES, EXCHANGE INTERACTIONS, GAUGE INVARIANCE, P INVARIANCE, PARITY, PARTICLE MODELS, PHOTON-NUCLEON INTERACTIONS, PHOTOPRODUCTION, PIONS MINUS, PIONS PLUS, REGGE POLES, RHO-765 RESONANCES, SCATTERING AMPLITUDES
A RESONANCES, AMPLITUDES, ANTIMATTER, ANTIMESONS, ANTIPARTICLES, BARYON RESONANCES, BARYONS, BASIC INTERACTIONS, BOSONS, ELECTROMAGNETIC INTERACTIONS, ELEMENTARY PARTICLES, FERMIONS, HADRONS, INTERACTIONS, INVARIANCE PRINCIPLES, MATHEMATICAL MODELS, MATTER, MESON RESONANCES, MESONS, N*RESONANCES, PARTICLE INTERACTIONS, PARTICLE PRODUCTION, PARTICLE PROPERTIES, PHOTON-BARYON INTERACTIONS, PHOTON-HADRON INTERACTIONS, PIONS, PSEUDOSCALAR ANTIMESONS, PSEUDOSCALAR MESONS, RESONANCE PARTICLES
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