期刊
PHYSICS LETTERS B
卷 710, 期 3, 页码 486-488出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physletb.2012.03.025
关键词
Quark orbital angular momentum; Transverse-momentum dependent parton distributions; Quark models
资金
- European Community [283286]
- Italian MIUR [2008EKLACK]
- P2I (Physique des deux Infinis) project
We study the connection between the quark orbital angular momentum and the pretzelosity transverse-momentum dependent parton distribution function. We discuss the origin of this relation in quark models, identifying as key ingredient for its validity the assumption of spherical symmetry for the nucleon in its rest frame. Finally we show that the individual quark contributions to the orbital angular momentum obtained from this relation cannot be interpreted as the intrinsic contributions, but include the contribution from the transverse centre of momentum which cancels out only in the total orbital angular momentum. (C) 2012 Elsevier B.V. All rights reserved.
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