Neutron Charge Density from Simple Pion Cloud Models

Abstract

The physical nucleon is modeled as a bare nucleon surrounded by a pion cloud using a psuedoscalar pion-nucleon coupling to examine its implications for the neutron form factor, F_1, and the corresponding transverse charge density in the infinite momentum frame. Two versions, one with a tunable Pauli-Villars parameter, and one with light-front cloudy-bag pion-nucleon form factors, are examined. A qualitative agreement with the experimental form factor (negative definite for all Q^2) and transverse charge density are achieved when the nucleon is treated as having a finite extent. The bare nucleon must have a finite extent if this model is to account for a negative definite F_1, and consequently a negative transverse charge density of the neutron at its center.

8 pages, 5 figures

References in corpus (8)

• Impact Parameter Space Interpretation for Generalized Parton Distributions
• Generalized parton distributions in impact parameter space
• Charge Density of the Neutron
• A new parameterization of the nucleon elastic form factors
• Flavour and Spin of the Proton and the Meson Cloud
• Light Front Cloudy Bag Model: Nucleon Electromagnetic Form Factors
• Empirical transverse charge densities in the nucleon and the nucleon-to-$\Delta$ transition
• Comparison of Nucleon Form Factors from Lattice QCD Against the Light Front Cloudy Bag Model and Extrapolation to the Physical Mass Regime

Cited by in corpus (7)

• Transverse Charge Densities
• Electromagnetic Form Factors and Charge Densities From Hadrons to Nuclei
• Quantifying the nucleon's pion cloud with transverse charge densities
• Two-dimensional charge distributions of the $\Delta$ baryon: Interpolation between the nonrelativistic and ultrarelativistic limit
• Kaon transverse charge density from space- and timelike data
• Analysis of excited quark propagator effects on neutron charge form factor
• Comparisons of electric charge and axial charge meson cloud distributions in the PCQM