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The European Physical Journal C

, Volume 52, Issue 1, pp 121–131 | Cite as

Parton distribution functions and quark orbital motion

Regular Article - Theoretical Physics

Abstract

A covariant version of the quark–parton model is studied. The dependence of the structure functions and parton distributions on the 3D intrinsic motion of the quarks is discussed. The important role of the orbital momentum of the quark, which is a particular case of intrinsic motion, appears as a direct consequence of the covariant description. The effect of the orbital motion is substantial, especially for polarized structure functions. At the same time, the procedure for obtaining the momentum distributions of polarized quarks from the combination of polarized and unpolarized structure functions is suggested.

Keywords

Structure Function Momentum Distribution Rest Frame Orbital Motion Parton Distribution Function 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag / Società Italiana di Fisica 2007

Authors and Affiliations

  1. 1.Institute of PhysicsAcademy of Sciences of the Czech RepublicPrague 8Czech Republic

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