Quark Imaging in the Proton Via Quantum Phase-Space Distributions

Details Quark Imaging in the Proton Via Quantum Phase-Space Distributions Quark Imaging in the Proton Via Quantum Phase-Space Distributions

2003-07-31

arxiv.org/abs/hep-ph/0307383v1

Phys.Rev.D69:074014,2004

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages with 3 fitures

Scientific paper

10.1103/PhysRevD.69.074014

We develop the concept of quantum phase-space (Wigner) distributions for quarks and gluons in the proton. To appreciate their physical content, we analyze the contraints from special relativity on the interpretation of elastic form factors, and examine the physics of the Feynman parton distributions in the proton's rest frame. We relate the quark Wigner functions to the transverse-momentum dependent parton distributions and generalized parton distributions, emphasizing the physical role of the skewness parameter. We show that the Wigner functions allow to visualize quantum quarks and gluons using the language of the classical phase space. We present two examples of the quark Wigner distributions and point out some model-independent features.

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