Next-to-leading order QCD corrections to ATT for prompt photon production
A. Mukherjee, M. Stratmann, W. Vogelsang
Abstract
We present a next-to-leading order QCD calculation of the cross section for isolated large-pT prompt photon production in collisions of transversely polarized protons. We devise a simple method of dealing with the phase space integrals in dimensional regularization in the presence of the cos(2 phi) azimuthal-angular dependence occurring for transverse polarization. Our results allow to calculate the double-spin asymmetry ATT for this process at next-to-leading order accuracy, which may be used at BNL-RHIC to measure the transversity parton distributions of the proton.
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