Exclusive diffractive processes and the quark substructure of mesons

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 $KN$ elastic scattering data. The model is then used to predict vector-meson electroproduction observables. The obtained $\rho$- and $\varphi$-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 $\rho$-, $\varphi$- and $J/\psi$-meson electroproduction cross sections observed in recent experiments.

53 pages, 23 figures, revtex and epsfig. Minor additions to text

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Cited by in corpus (50)

• pi- and K-meson Bethe-Salpeter Amplitudes
• Bethe-Salpeter Study of Vector Meson Masses and Decay Constants
• Survey of heavy-meson observables
• Valence-quark distributions in the pion
• Pseudovector components of the pion, pi^0 -> gamma gamma, and F_pi(q^2)
• Electromagnetic form factors of light vector mesons
• Nucleon resonances in omega photoproduction
• Photoproduction of phi mesons from the proton: Polarization observables and strangeness in the nucleon
• Semileptonic decays of heavy mesons
• Nature of $X(6900)$ and its production mechanism at LHCb
• Vector-meson production and vector meson dominance
• Nucleon Resonances with Hidden Charm in $\gamma p$ reactions
• Spin effects and baryon resonance dynamics in phi-meson photoproduction at few GeV
• Rho meson photoproduction at low energies
• Meson-loop contributions to the rho-omega mass splitting & rho charge radius
• Nucleonic resonance excitations with linearly polarized photon in $\gamma p\to \omega p$
• Heavy- to light-meson transition form factors
• Current Conservation in the Covariant Quark-Diquark Model of the Nucleon
• Hadronic decays of mesons and baryons in the Dyson-Schwinger approach
• One-loop corrections to omega photoproduction near threshold
• Deconfinement and Hadron Properties at Extremes of Temperature and Density
• New anomalous trajectory in Regge theory
• Systematic Regge theory analysis of omega photoproduction
• Analysis of chiral and thermal susceptibilities
• Radiative two-pion decay of the tau lepton
• Gauge invariance and finite width effects in radiative two-pion tau lepton decay
• Nucleonic resonance effects in the $\varphi$ meson photoproduction
• Neutron electric dipole moment: Constituent-dressing and compositeness
• Photo-production of Bound States with Hidden Charms
• Photoproduction of phi meson off deuteron near threshold
• Non-diffractive mechanisms in the $\varphi$ meson photoproduction on nucleons
• K_{l 3} and π_{e 3} transition form factors
• Exclusive electroproduction of phi mesons at 4.2 GeV
• Models of $J/\Psi$ photo-production reactions on the nucleon
• First measurement of coherent $\varphi$-meson photoproduction from helium-4 near threshold
• Pseudoscalar charmonium pair interactions via the Pomeron exchange mechanism
• Asymmetries in phi photoproduction and the OZI violation
• Probing nucleon strangeness structure with phi electroproduction
• Contributions of vector meson photoproduction to the Gerasimov-Drell-Hearn sum rule
• K Kbar photoproduction and S-P wave interference
• Pomeron, nucleon-resonance, and $(0^{+},0^{-},1^{+})$-meson contributions in $\varphi$-meson photoproduction
• Tensor meson photoproduction as a final state interaction effect
• Exclusive electroproduction and the quark structure of the nucleon
• An isotopic effect in phi photoproduction at a few GeV
• Investigation of electroproduction of $\varphi$ mesons off protons
• Features of forward $\pi N$ scattering from a Reggeized model
• Off Mass Shell Effects in Hadron Electric Dipole Moments
• Anomalous f_1 exchange in vector meson photoproduction asymmetries
• A Charge-Conjugation-Invariance Constrained Pomeron-Quark Coupling
• Dynamical model of $\varphi$ meson photoproduction on the nucleon and ${}^{4}He$