Neutron charge density from simple pion cloud models

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, F1(Q2), and the corresponding transverse charge density, ρ(b), in the infinite momentum frame. Two versions, one with a tunable Pauli-Villars parameter and another with light-front cloudy-bag pion-nucleon form factors, are examined. A qualitative agreement with the experimental form factor (F1<0 for all Q2) and transverse charge density is 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 F1 and consequently a negative transverse charge density of the neutron at its center.