Lorentz invariance relations between parton distributions and the Wandzura-Wilczek approximation

preprint2009arXivOpen access

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.

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