Transversity K Factors for Drell-Yan

Abstract

The question of the K factor in transversely polarised Drell-Yan (DY) processes is examined. The transverse-spin case is peculiar for the absence of a reference point in deeply inelastic scattering (DIS). Therefore, in order to study more fully the possible effects of higher-order corrections on DY asymmetries, a DIS definition for transversity is devised using a hypothetical scalar (Higgs-like) vertex. The results show that some care may be required in interpreting experimentally extracted partonic transversity, in particular when comparing with model calculations or predictions.

Comments: 8 pages, 4 figures (eps and feynmp); uses standard LaTeX/MiKTeX packages [svjour.cls, amsmath, bbm, feynmp, graphicx, maybemath, natbib, psfrag, slashed] some homespun packages (included in the zip file); discussion augmented, 1 figure removed; resubmitted to Eur. Phys. J. section C