We review the study the Wandzura-Wilczek relation for the structure function g2, with a particular attention on the connection with the framework of Transverse Momentum Dependent factorization.We emphasize that the relation is broken by two distinct twist-3 terms. In the light of these findings, we clarify what can be deduced from the available experimental data on g2, which indicate a breaking of the order 20-40%, and how to individually measure the twist-3 terms.
What can we learn from the breaking of the Wandzura-Wilczek relation?
BACCHETTA, ALESSANDRO;
2009-01-01
Abstract
We review the study the Wandzura-Wilczek relation for the structure function g2, with a particular attention on the connection with the framework of Transverse Momentum Dependent factorization.We emphasize that the relation is broken by two distinct twist-3 terms. In the light of these findings, we clarify what can be deduced from the available experimental data on g2, which indicate a breaking of the order 20-40%, and how to individually measure the twist-3 terms.File in questo prodotto:
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