Transversity and Drell-Yan $K$-Factors

Abstract

The Drell-Yan $K$-factors for transversely polarised hadrons are examined. Since transverse spin is peculiar in having no DIS reference point, the effects of higher-order corrections on DY asymmetries are examined via a DIS definition for transversity devised using a hypothetical scalar vertex. The results suggest that some care may be required when interpreting experimentally extracted partonic transversity, particularly when comparing with model calculations or predictions.Comment: 4 pages, 2 figures (eps and feynmp); uses World Scientific class ws-procs9x6, standard LaTeX/MiKTeX packages [amsmath, feynmp, graphicx, natbib, psfrag] and one homespun package (included in the zip file); contributed talk to appear in proc. of the XVI Int. Symp. on High-Energy Spin Physics, Trieste (Oct. 2004