Exclusive diffractive processes and the quark substructure of mesons

Phys. Rev. D 56, 1644 – Published 1 August 1997
M. A. Pichowsky and T.-S. H. Lee

Abstract

Exclusive diffractive processes on the nucleon are investigated within a model in which the quark-nucleon interaction is mediated by Pomeron exchange and the quark substructure of mesons is described within a framework based on the Dyson-Schwinger equations of QCD. The model quark-nucleon interaction has four parameters which are completely determined by high-energy πN and KN elastic scattering data. The model is then used to predict vector-meson electroproduction observables. The obtained ρ- and φ-meson electroproduction cross sections are in excellent agreement with experimental data. The predicted q2 dependence of J/ψ-meson electroproduction also agrees with experimental data. It is shown that confined-quark dynamics plays a central role in determining the behavior of the diffractive, vector-meson electroproduction cross section. In particular, the onset of the asymptotic 1/q4 behavior of the cross section is determined by a momentum scale that is set by the current-quark masses of the quark and antiquark inside the vector meson. This is the origin of the striking differences between the q2 dependence of ρ-, φ-, and J/ψ-meson electroproduction cross sections observed in recent experiments.

DOI: http://dx.doi.org/10.1103/PhysRevD.56.1644

  • Received 18 December 1996
  • Published in the issue dated 1 August 1997

© 1997 The American Physical Society

Authors & Affiliations

M. A. Pichowsky

  • Physics Division, Argonne National Laboratory, Argonne, Illinois 60439-4843
  • Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260

T.-S. H. Lee

  • Physics Division, Argonne National Laboratory, Argonne, Illinois 60439-4843

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