Light-front transverse charge densities

Abstract

We discuss the recent interpretation of quark-distribution functions in the plane transverse to the light-cone direction. Such a mapping is model independent and allows one to build up multidimensional pictures of the hadron and to develop a semi-classical interpretation of the quark dynamics. We comment briefly the results obtained from the form factors of the nucleon. We show that a generalization to a target with arbitrary spin leads to a set of preferred values for the electromagnetic coupling characterizing structureless particles. Finally, we present the Wigner distribution for an unpolarized quark in an unpolarized proton and we propose an interpretation of the observed distortion as due to the orbital angular momentum of the quark.

Contributed to the 19th International Spin Physics Symposium (SPIN 2010), Sep 27-Oct 2, 2010, Juelich, Germany. 5 pages, 2 figures, 1 table, uses jpconf.cls, jpconf11.clo, iopams.sty (included)

References in corpus (9)

• Charge Density of the Neutron
• Generalized parton correlation functions for a spin-1/2 hadron
• Transverse momentum dependent parton distributions in a light-cone quark model
• Empirical transverse charge densities in the nucleon and the nucleon-to-$\Delta$ transition
• Nucleon spin densities in a light-front constituent quark model
• Quark transverse charge densities in the $\Delta (1232)$ from lattice QCD
• Electromagnetic Properties for Arbitrary Spin Particles: Part 2 $-$ Natural Moments and Transverse Charge Densities
• Empirical transverse charge densities in the deuteron
• Baryon vector and axial content up to the 7Q component