QCD-oriented nondiagonal GVDM
E. V. Bugaev, B. V. Mangazeev, Y. V. Shlepin
TL;DR
This paper develops a QCD-based nondiagonal GVDM for photoabsorption, highlighting the importance of cutoff factors for accurate predictions and using a relativistic quark model with two-gluon exchange.
Contribution
It introduces a QCD-motivated nondiagonal GVDM incorporating meson wave functions and two-gluon exchange, emphasizing the role of cutoff factors in photoabsorption calculations.
Findings
Destructive interference effects are small in the model.
GVDM predictions require cutoff factors for accuracy.
Two-gluon exchange approximation is used for meson-nucleon scattering.
Abstract
The nondiagonal generalized vector dominance model (GVDM) of photoabsorption is elaborated using QCD-motivated picture of the (gamma)-(q,anti q) - transition and subsequent meson dominated scattering of the (q, anti q)-pair on the nucleon. The relativistic constituent quark model for a description of the meson (q, anti q)-wave functionsis used. The meson-nucleon scattering is calculated in the two-gluon exchange approximation. It is shown that the destructive interference effects and corresponding cancellations in the photoabsorption cross section formula are small, so the GVDM predictions are incorrect if no extra cut-off factors in GVDM formulas are introduced.
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Taxonomy
TopicsQuantum Chromodynamics and Particle Interactions · Particle physics theoretical and experimental studies · High-Energy Particle Collisions Research