Instanton Contribution to the Proton and Neutron Electric Form Factors

Abstract

We study the instanton contribution to the proton and neutron electric form factors. Using the single instanton approximation, we perform the calculations in a mixed time-momentum representation in order to obtain the form factors directly in momentum space. We find good agreement with the experimentally measured electric form factor of the proton. For the neutron, our result falls short of the experimental data. We argue that this discrepancy is due to the fact that we neglect the contribution of the sea quarks. We compare to lattice calculations and a relativistic version of the quark-diquark model.

arXiv comment8 pages, 5 figures, updated references, to appear in Phys. Lett. B

References in corpus (15)

• Instantons in QCD
• Diquark Bose Condensates in High Density Matter and Instantons
• The ratio of proton's electric to magnetic form factors measured by polarization transfer
• Measurement of GEp/GMp in ep -> ep to Q2 = 5.6 GeV2
• The Charge Form Factor of the Neutron from the Reaction \pol{2H}(\pol{e},e'n)p
• A Measurement of the Electric Form Factor of the Neutron through $\vec{d}(\vec{e},e^{\prime }n)p$ at $Q^2=0.5$ (GeV/c)${}^2$
• Baryonic Correlation Functions in the Random Instanton Vacuum
• Lattice Calculation of the Strangeness Magnetic Moment of the Nucleon
• Mesonic Correlation Functions in the Random Instanton Vacuum
• Lattice Calculation of Point-to-Point Hadron Current Correlation
• Chiral Limit of Nucleon Lattice Electromagnetic Form Factors
• Electromagnetic Form Factors of Nucleons in a Light-cone Diquark Model
• Systematic Study of the Single Instanton Approximation in QCD
• Proton Electro-Magnetic Form-Factors in the Instanton Liquid Model
• Parameter free calculation of hadronic masses from instantons

Cited by in corpus (11)

• QCD Topology at Finite Temperature: Statistical Mechanics of Selfdual Dyons
• Instanton Contribution to the Pion Electro-Magnetic Formfactor at Q^2 > 1 GeV^2
• Exploring the Chiral Regime of QCD in the Interacting Instanton Liquid Model
• The Pauli form factor of the quark induced by instantons
• Instanton Contribution to the Electro-Magnetic Form Factors of the Nucleon
• Instanton Corrections to Quark Form Factor at Large Momentum Transfer
• 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
• 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