QCD-oriented nondiagonal GVDM

Details QCD-oriented nondiagonal GVDM QCD-oriented nondiagonal GVDM

1999-12-16

arxiv.org/abs/hep-ph/9912384v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 p

Scientific paper

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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