Lorentz invariance relations between parton distributions and the Wandzura-Wilczek approximation
arXiv:0810.5212 · doi:10.1016/j.physletb.2009.08.052
Abstract
The violation of the so-called Lorentz invariance relations between parton distribution functions is considered in a model independent way. It is shown that these relations are not violated in a generalized Wandzura-Wilczek approximation, indicating that numerically their violation may be small.
13 pages, added references, minor changes, to appear in Phys. Lett. B