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Twist-three distributions and their appearance in the doubly-polarized Drell-Yan process

R. D. Tangerman·P. J. Mulders
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Abstract

The twist-three distributions $g_2(x)$ and $h_2(x)$ 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 $g_2$ can be derived and a similar sum rule for $h_2$. Their role in the Drell-Yan double-spin asymmetry $A_{LT}$ is explained.

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R. D. Tangerman, P. J. Mulders. 1995-10-30. Twist-three distributions and their appearance in the doubly-polarized Drell-Yan process. https://arxiv.org/abs/hep-ph/9510446

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