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Abstract: We analyze the breaking of the Wandzura-Wilczek relation for the g 2structure function, emphasizing its connection with transverse momentumdependent parton distribution functions. We find that the relation is broken bytwo distinct twist-3 terms, and clarify how these can be separated inmeasurements of double-spin asymmetries in semi-inclusive deep inelasticscattering. Through a quantitative analysis of available g 2 data we also showthat the breaking of the Wandzura-Wilczek relation can be as large as 15-30% ofthe size of g 2.



Author: Alberto Accardi, Alessandro Bacchetta, W. Melnitchouk, Marc Schlegel

Source: https://arxiv.org/







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