The QCD-Oriented Vector Dominance Model
E.V. Bugaev (Institute for Nuclear Research, Moscow, Russia), B.V., Mangazeev (Irkutsk State University, Irkutsk, Russia)
TL;DR
This paper investigates the total photoabsorption cross section on nucleons using a QCD-based vector dominance model, emphasizing the importance of a p-cut-off for convergence in vector meson contributions.
Contribution
It introduces a QCD-oriented vector dominance model with off-diagonal transitions and demonstrates the necessity of a p-cut-off for accurate summation over vector mesons.
Findings
Off-diagonal transitions have significant contributions.
Destructive interference is not dominant.
A p-cut-off is essential for convergence.
Abstract
The total photoabsorption cross section on the nucleon is studied using nondiagonal GVDM. Vector meson-nucleon scattering amplitudes are calculated in two-gluon exchange approximation of QCD. The off-diagonal transitions of diffraction dissociation type between different vector mesons and their contributions to the expression for the total photoabsorption cross section on the nucleon are also calculated. It is shown that destructive interference of diagonal and off-diagonal terms is not effective. The main conclusion is that a p-cut-off in gamma-quark antiquark transition is necessary for obtaining the convergence in the summation over all vector meson contributions.
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Taxonomy
TopicsParticle physics theoretical and experimental studies · Quantum Chromodynamics and Particle Interactions · High-Energy Particle Collisions Research