Double-transverse spin asymmetries at NLO

We report on a next-to-leading order QCD calculation of the cross section and the spin asymmetry for isolated large-p_T prompt photon production in collisions of transversely polarized protons. Corresponding measurements may be used at RHIC to determine the transversity parton distributions of the proton.Comment: 3 pages, LaTeX, 1 figure as eps file. Invited talk presented by W. Vogelsang at the "Conference on the Intersections of Particle and Nuclear Physics (CIPANP 2003)", New York City, May 19-24, 200

Transverse-spin physics: Highlights and news

We describe a few of the recent theory highlights in the field of transverse-spin physics

Parton Distributions from Photoproduction in Polarized ep Scattering at HERA

We study photoproduction of jets and single-inclusive hadrons in a polarized ep collider mode of HERA at sqrt(s)=300 GeV, examining the sensitivity of the cross sections and their asymmetries to the proton's polarized gluon distribution and to the completely unknown parton distributions of polarized photons. We also present for the first time the NLO corrections to the direct part of polarized single-inclusive hadron photoproduction.Comment: 10 Pages, LaTeX, 7 figures as eps files, Invited talk presented at the workshop `Deep Inelastic Scattering off Polarized Targets: Theory Meets Experiment', Zeuthen, Germany, September 1-5, 199

Global analysis of helicity PDFs: past - present - future

We discuss the current status of the DSSV global analysis of helicity-dependent parton densities. A comparison with recent semi-inclusive DIS data from COMPASS is presented, and constraints on the polarized strangeness density are examined in some detail.Comment: Talk presented at the XIX Int. Workshop on Deep-Inelastic Scattering and Related Subjects (DIS 2011); 4 pages; 2 figure

Some Aspects of Polarized ep Scattering at HERA

We study photoproduction reactions in a polarized ep collider mode of HERA at sqrt(s)=298 GeV. We examine the sensitivity of the cross sections and their asymmetries to the proton's polarized gluon distribution and to the completely unknown parton distributions of longitudinally polarized photons.Comment: 11 Pages, LaTeX, 6 figures as eps files, talk presented at the Ringberg Workshop on New Trends in HERA Physics, Ringberg Castle, Germany, 25-30 May 199