Single Transverse-Spin Asymmetries in Hadronic Pion Production

Abstract

We analyze single transverse-spin asymmetries for hadronic pion production at large transverse momenta using QCD factorization. In the large $x_F$ region, leading contributions to the asymmetries are naturally produced by twist-3 parton correlation functions that couple quark fields and gluon field strengths. With a simple model for these matrix elements, leading-order asymmetries calculated from QCD are consistent with data on pion production from Fermilab, and can be used to predict single-spin asymmetries at RHIC. We argue that our perturbative calculation for the asymmetries is relevant to pion transverse momenta as low as a few GeV.

Revtex, 52 pages, 29 figures, 2 tables

References in corpus (2)

• Single spin asymmetries from a gluonic background in the Drell-Yan process
• Phenomenology of Power Corrections in Fragmentation Processes in e^+ e^- Annihilation

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