Light front cloudy bag model: Nucleon electromagnetic form factors

The nucleon is modeled, using light front dynamics, as a relativistic system of three bound constituent quarks surrounded by a cloud of pions. The pionic cloud is important for understanding low-momentum transfer physics, especially the neutron charge radius, but the quarks are dominant at high values of $Q^2.$ The model achieves a very good description of existing data for the four electromagnetic elastic form factors.