The twist-four quark and gluon distributions in a transversely polarized nucleon are identified and relations among them are discussed by using QCD equations of motion. At the order of O(1/${\mathit{Q}}^2$), the Drell-Yan cross section in transversely polarized nucleon-nucleon collisions is expressed in terms of these distributions.

• Received 2 June 1993

DOI:https://doi.org/10.1103/PhysRevD.50.4429