Orbital Angular Momentum Parton Distributions in Light-Front Dynamics

Details Orbital Angular Momentum Parton Distributions in Light-Front Dynamics Orbital Angular Momentum Parton Distributions in Light-Front Dynamics

2000-02-10

arxiv.org/abs/hep-ph/0002113v1

Phys.Rev. D62 (2000) 054023

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages; latex; 3 ps figures

Scientific paper

10.1103/PhysRevD.62.054023

We study the quark angular momentum distribution in the nucleon within a light-front covariant quark model. Special emphasis is put into the orbital angular momentum: a quantity which is very sensitive to the relativistic treatment of the spin in a light-front dynamical approach. Discrepancies with the predictions of the low-energy traditional quark models where relativistic spin effects are neglected, are visible also after perturbative evolution to higher momentum scales. Orbital angular momentum distributions and their contribution to the spin sum rule are calculated for different phenomenological mass operators and compared with the results of the MIT bag model.

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