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Plebeian dynamical model for. gamma. N. -->. pi. /sup + -/. delta. [Gauge invariance, scattering amplitudes, differential cross sections, unnatural parity exchange]

Technical Report ·
DOI:https://doi.org/10.2172/7311779· OSTI ID:7311779

An elementary phenomenological extension of the gauge invariance constrained dynamical amplitudes for ..gamma..N ..-->.. ..pi../sup +-/..delta.. 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 ..gamma..p ..-->.. ..pi../sup -/..delta../sup + +/. The remainder of the natural parity exchange is represented by rho- and A/sub 2/- exchange. Predictions are made for dsigma/dt and ..sigma.., for the various charge states and the unnatural parity exchange components are well described in each case.

Research Organization:
Texas A and M Univ., College Station (USA). Dept. of Physics
OSTI ID:
7311779
Report Number(s):
ORO-5223-04
Country of Publication:
United States
Language:
English

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Related Subjects

645202* -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Electromagnetic Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
A RESONANCES
A2-1310 RESONANCES
AMPLITUDES
ASYMMETRY
BARYON RESONANCES
BARYONS
BASIC INTERACTIONS
BOSONS
CROSS SECTIONS
DELTA-1236 RESONANCES
DIFFERENTIAL CROSS SECTIONS
ELECTRIC CHARGES
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
EXCHANGE INTERACTIONS
FERMIONS
GAUGE INVARIANCE
HADRONS
INTERACTIONS
INVARIANCE PRINCIPLES
MATHEMATICAL MODELS
MESON RESONANCES
MESONS
N)RESONANCES
P INVARIANCE
PARITY
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PRODUCTION
PARTICLE PROPERTIES
PHOTON-BARYON INTERACTIONS
PHOTON-HADRON INTERACTIONS
PHOTON-NUCLEON INTERACTIONS
PHOTOPRODUCTION
PIONS
PIONS MINUS
PIONS PLUS
PSEUDOSCALAR MESONS
REGGE POLES
RESONANCE PARTICLES
RHO-765 RESONANCES
SCATTERING AMPLITUDES
TENSOR MESONS
VECTOR MESONS