Twist-three distributions and their appearance in the doubly-polarized Drell-Yan process
R. D. Tangerman, P. J. Mulders
Abstract
The twist-three distributions g2(x) and h2(x) are defined as quark-field matrix elements between polarized hadron states. They can be written in terms of quark-mass and gluonic operators, after which the Burkhardt-Cottingham sum rule for g2 can be derived and a similar sum rule for h2. Their role in the Drell-Yan double-spin asymmetry ALT is explained.
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