On the validity of Lorentz invariance relations between parton distributions

Details On the validity of Lorentz invariance relations between parton distributions On the validity of Lorentz invariance relations between parton distributions

2004-06-25

arxiv.org/abs/hep-ph/0406289v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, talk presented by MS at the 10th Workshop on High Energy Spin Physics, Dubna, Russia, September 2003

Scientific paper

Lorentz invariance relations connecting twist-3 parton distributions with transverse momentum dependent twist-2 distributions have been proposed previously. These relations can be extracted from a covariant decomposition of the quark-quark correlator. It is argued, however, that the derivation of the Lorentz invariance relations fails if the path-ordered exponential is taken into account in the correlator. The model independent analysis is supplemented by an explicit calculation of the corresponding parton distributions in perturbative QCD with a quark target, and in a simple spectator model. We also clarify the status of a specific calculation of time-reversal even parton distributions in light-cone gauge.

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