A Note on Wandzura-Wilczek Relations
High Energy Physics - Phenomenology
2009-11-07 v1
Abstract
Wandzura-Wilczek (WW) relations between matrix-elements of bilocal light-ray operators have recently regained interest in connection with off-forward scattering processes. Originally derived for matrix elements over leading-twist operators, their generalization to off-forward and exclusive processes gets complicated by the presence of higher-twist operators that are total derivatives of leading-twist ones and do not contribute to forward-scattering. We demonstrate that, for exclusive matrix-elements, the inclusion of these operators into WW-relations is essential for fulfilling constraints imposed by the conformal symmetry of massless QCD.
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Cite
@article{arxiv.hep-ph/0103080,
title = {A Note on Wandzura-Wilczek Relations},
author = {Patricia Ball and Markus Lazar},
journal= {arXiv preprint arXiv:hep-ph/0103080},
year = {2009}
}
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4 pages RevTex