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Next-to-leading order QCD corrections to A_TT for prompt photon production

A. Mukherjee·M. Stratmann·W. Vogelsang
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Abstract

We present a next-to-leading order QCD calculation of the cross section for isolated large-p_T 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 A_TT 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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A. Mukherjee, M. Stratmann, W. Vogelsang. 2003-03-26. Next-to-leading order QCD corrections to A_TT for prompt photon production. https://doi.org/10.1103/physrevd.67.114006

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