Instanton Contribution to the Pion Electro-Magnetic Formfactor at Q^2 > 1 GeV^2

Abstract

We study the effects of instantons on the charged pion electro-magnetic formfactor at intermediate momenta. In the Single Instanton Approximation (SIA), we predict the pion formfactor in the kinematic region Q^2=2-15 GeV^2. By developing the calculation in a mixed time-momentum representation, it is possible to maximally reduce the model dependence and to calculate the formfactor directly. We find the intriguing result that the SIA calculation coincides with the vector dominance monopole form, up to surprisingly high momentum transfer Q^2~10 GeV^2. This suggests that vector dominance for the pion holds beyond low energy nuclear physics.

arXiv comment8 pages, 5 figures, minor revisions

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Cited by in corpus (21)

• QCD Topology at Finite Temperature: Statistical Mechanics of Selfdual Dyons
• Pion form factor and QCD sum rules: case of axial current
• Pion transverse charge density from timelike form factor data
• Electromagnetic form factors of the pion and kaon from the instanton vacuum
• Are There Diquarks in the Nucleon?
• Nonperturbative quark-antiquark interactions in mesonic form factors
• Quark-hadron duality and hadron properties from correlators of pseudoscalar and axial currents
• Pion electromagnetic form factor, perturbative QCD, and large-Nc Regge models
• Exploring the Chiral Regime of QCD in the Interacting Instanton Liquid Model
• Instantons, diquarks and non-leptonic weak decays of hyperons
• Pion form factor and QCD sum rules: case of pseudoscalar current
• Instanton Contribution to the Electro-Magnetic Form Factors of the Nucleon
• Computing the Effective Hamiltonian of Low-Energy Vacuum Gauge Fields
• Instantons, Chiral Dynamics and Hadronic Resonances
• The Pauli Form Factor of Quark and Nontrivial Topological Structure of the QCD
• Dimensional reduction and the generalized pion in a magnetic field within the NJL model
• Instanton-Induced Correlations in Hadrons
• Light charged pion in ultra-strong magnetic field
• Quantum Interactions Between Non-Perturbative Vacuum Fields
• Instanton effects on the twist-three light-cone distribution amplitudes of pion and light scalar mesons above 1GeV
• Meson loop effects on the pion electromagnetic form factor