Exclusive diffractive processes and the quark substructure of mesons

Journal Article · Fri Aug 01 00:00:00 EDT 1997 · Physical Review, D

DOI:https://doi.org/10.1103/PhysRevD.56.1644· OSTI ID:527133

Pichowsky, M A ^[1]; Lee, T H ^[1]

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1. Physics Division, Argonne National Laboratory, Argonne, Illinois 60439-4843 (United States)

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 KN 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{sup 2} dependence of J/{psi}-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/q{sup 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{sup 2} dependence of {rho}-, {phi}-, and J/{psi}-meson electroproduction cross sections observed in recent experiments. {copyright} {ital 1997} {ital The American Physical Society}

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 527133
• Journal Information: Physical Review, D, Vol. 56, Issue 3; Other Information: PBD: Aug 1997
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
NUCLEONS
DIFFRACTION
QUANTUM CHROMODYNAMICS
SCHWINGER FUNCTIONAL EQUATIONS
VECTOR MESONS
QUARKS
ELECTRON-NUCLEON INTERACTIONS
POMERANCHUK PARTICLES
QUARK-HADRON INTERACTIONS
PION-NUCLEON INTERACTIONS
KAON-NUCLEON INTERACTIONS
ELASTIC SCATTERING
ELECTROPRODUCTION
RHO-770 MESONS
PHI-1020 MESONS
CROSS SECTIONS
MASS
J PSI-3097 MESONS