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Next-to-leading order QCD corrections to<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="italic">A</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="italic">T</mml:mi><mml:mi>T</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>for prompt photon production
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 $\mathrm{cos}(2\ensuremath{\Phi})$ azimuthal-angular dependence occurring for transverse polarization. …