dorsal/arxiv
View SchemaExclusive diffractive processes and the quark substructure of mesons
| Authors | M. A. Pichowsky, T. -S. H. Lee |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9612049 |
| URL | https://arxiv.org/abs/nucl-th/9612049 |
| DOI | 10.1103/PhysRevD.56.1644 |
| Journal | Phys. Rev. D 56, 1644 (1997) |
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 $\pi N$ and $K N$ elastic scattering data. The model is then used to predict vector-meson electroproduction observables. The obtained $\rho$- and $\phi$-meson electroproduction cross sections are in excellent agreement with experimental data. The predicted $q^2$ dependence of $J/\psi$-meson electroproduction also agrees with experimental data. It is shown that confined-quark dynamics play a central role in determining the behavior of the diffractive, vector-meson electroproduction cross section. In particular, the onset of the asymptotic $1/q^4$ 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 $q^2$ dependence of $\rho$-, $\phi$- and $J/\psi$-meson electroproduction cross sections observed in recent experiments.
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"abstract": "Exclusive diffractive processes on the nucleon are investigated within a\nmodel in which the quark-nucleon interaction is mediated by Pomeron exchange\nand the quark substructure of mesons is described within a framework based on\nthe Dyson-Schwinger equations of QCD. The model quark-nucleon interaction has\nfour parameters which are completely determined by high-energy $\\pi N$ and $K\nN$ elastic scattering data. The model is then used to predict vector-meson\nelectroproduction observables. The obtained $\\rho$- and $\\phi$-meson\nelectroproduction cross sections are in excellent agreement with experimental\ndata. The predicted $q^2$ dependence of $J/\\psi$-meson electroproduction also\nagrees with experimental data. It is shown that confined-quark dynamics play a\ncentral role in determining the behavior of the diffractive, vector-meson\nelectroproduction cross section. In particular, the onset of the asymptotic\n$1/q^4$ behavior of the cross section is determined by a momentum scale that is\nset by the current-quark masses of the quark and antiquark inside the vector\nmeson. This is the origin of the striking differences between the $q^2$\ndependence of $\\rho$-, $\\phi$- and $J/\\psi$-meson electroproduction cross\nsections observed in recent experiments.",
"arxiv_id": "nucl-th/9612049",
"authors": [
"M. A. Pichowsky",
"T. -S. H. Lee"
],
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"hep-ph"
],
"doi": "10.1103/PhysRevD.56.1644",
"journal_ref": "Phys. Rev. D 56, 1644 (1997)",
"title": "Exclusive diffractive processes and the quark substructure of mesons",
"url": "https://arxiv.org/abs/nucl-th/9612049"
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