Current-current model for vector-meson photoproduction and related processes. [Pomeron-photon analogy]

Journal Article · Fri Jul 01 04:00:00 EDT 1977 · Phys. Rev., D; (United States)

DOI:https://doi.org/10.1103/PhysRevD.16.29· OSTI ID:7319191

Actor, A

We extend the Pomeron-photon analogy (i.e., the idea that the couplings of Pomerons and photons to hadronic matter are similar) to vector-meson photoproduction and related processes, such as rho electroproduction and Compton scattering. To avoid directly coupling the Pomeron to photons, which is awkward in this model, we follow conventional vector-meson-dominance ideas and approximate the photon's hadronic component by the rho meson. We then make a current-current ansatz for the rho elastic scattering amplitude. Spin is fully taken into account. We find that s-channel helicity conservation (SCHC) cannot be realized within this framework if the effective current is conserved; SCHC requires that either this current has a nonconserved component or the forward cross section vanishes. If an effective current with two components is introduced: one a conserved electromagnetic central component, and the other a nonconserved peripheral component: then all the main features of rho photoproduction can be accounted for. The same model gives a good qualitative description of pp, ..pi..p, and Kp elastic scattering, and of diffractive dissociation; in other words, it provides a unified description of all diffractive phenomena. Both components of the effective current have a simple explanation in terms of the quark-parton model.

• Research Organization: Abteilung Physik, Universitaet Dortmund, Dortmund, West Germany
• OSTI ID: 7319191
• Journal Information: Phys. Rev., D; (United States), Journal Name: Phys. Rev., D; (United States) Vol. 16:1; ISSN PRVDA
• Country of Publication: United States
• Language: English

Related Subjects

645202* -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Electromagnetic Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYON-BARYON INTERACTIONS
BASIC INTERACTIONS
BOSONS
COMPOSITE MODELS
COMPTON EFFECT
CROSS SECTIONS
CURRENTS
DIFFRACTION MODELS
ELASTIC SCATTERING
ELECTROMAGNETIC INTERACTIONS
ELECTROPRODUCTION
ELEMENTARY PARTICLES
FORM FACTORS
HADRON-HADRON INTERACTIONS
HADRONS
INTERACTIONS
KAON-NUCLEON INTERACTIONS
KAON-PROTON INTERACTIONS
MATHEMATICAL MODELS
MESON RESONANCES
MESON-BARYON INTERACTIONS
MESON-NUCLEON INTERACTIONS
MESONS
NUCLEON-NUCLEON INTERACTIONS
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PRODUCTION
PARTICLE PROPERTIES
PARTON MODEL
PHOTOPRODUCTION
PION-NUCLEON INTERACTIONS
PION-PROTON INTERACTIONS
PROTON-NUCLEON INTERACTIONS
PROTON-PROTON INTERACTIONS
QUARK MODEL
RESONANCE PARTICLES
RHO-765 RESONANCES
S CHANNEL
SCATTERING
SPIN FLIP
T CHANNEL
VECTOR MESONS