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

R. D. Tangerman; P. J. Mulders

paper

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

arXiv:hep-ph/9510446

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 $A_{L T}$ is explained.

5 pages, Latex, figures included (uses feynman.tex), talk presented by R.D. Tangerman at 2nd Meeting on Possible Measurements of Singly Polarized pp and pn Collisions at HERA (DESY-IfH Zeuthen, Aug 31- Sep 2, 1995)