What can break the Wandzura--Wilczek relation?
High Energy Physics - Phenomenology
2014-11-20 v1
Abstract
We analyze the breaking of the Wandzura-Wilczek relation for the g_2 structure function, emphasizing its connection with transverse momentum dependent parton distribution functions. We find that the relation is broken by two distinct twist-3 terms, and clarify how these can be separated in measurements of double-spin asymmetries in semi-inclusive deep inelastic scattering. Through a quantitative analysis of available g_2 data we also show that the breaking of the Wandzura-Wilczek relation can be as large as 15-30% of the size of g_2.
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Cite
@article{arxiv.0907.2942,
title = {What can break the Wandzura--Wilczek relation?},
author = {Alberto Accardi and Alessandro Bacchetta and W. Melnitchouk and Marc Schlegel},
journal= {arXiv preprint arXiv:0907.2942},
year = {2014}
}
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12 pages