Soft-gluon resummation and NNLO corrections for direct photon production
Nikolaos Kidonakis, J.F. Owens
TL;DR
This paper develops a resummation technique for direct photon production in hadronic collisions, providing NNLO corrections that improve theoretical accuracy and reduce scale dependence, with comparisons to experimental data.
Contribution
It introduces a threshold logarithm resummation at NNLO accuracy for direct photon production, enhancing precision over previous methods.
Findings
Significant reduction in factorization scale dependence.
Analytical and numerical NNLO corrections provided.
Good agreement with experimental data from E-706 and UA-6.
Abstract
The resummation of threshold logarithms for direct photon production cross sections in hadronic collisions is presented. The resummation is based on the factorization properties of the cross section and is formulated at next-to-leading logarithmic or higher accuracy. Full analytical and numerical results for the next-to-next-to-leading order expansion of the resummed cross section are given. A substantial reduction of factorization scale dependence is observed. A comparison to experimental results from the E-706 and UA-6 experiments is presented.
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