2017/08/28 by Claudia Uebler, Andreas Schäfer, Werner Vogelsang
Mathematics · Physics and Astronomy · #Asymmetry #Gluon #Hadron #High-Energy Particle Collisions Research #Logarithm #Mathematics #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Photon #Physics #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quantum mechanics #Resummation #hep-ph
paper · pdf · doi:10.1103/physrevd.96.074026
published as Phys. Rev. D 96, 074026 (2017) · 11 pages, 9 figures
arxiv created 2017/08/28 · openalex created_date 2017/09/15 · openalex publication_date 2017/10/26 · arxiv updated 2017/11/01 · openalex updated_date 2026/08/05
We complete our earlier study of the ``direct'' part of the cross section and spin asymmetry for the photoproduction process \ensuremathγN\ensuremath→hX by analyzing the ``resolved'' contribution, for which the photon couples like a hadron through its parton structure. The incident photon and nucleon are longitudinally polarized and one observes a hadron h at high transverse momentum pT. Soft or collinear gluon emissions generate large logarithmic threshold corrections which we resum to next-to-leading logarithmic order. We compare our results with recent spin asymmetry data by the COMPASS Collaboration, highlighting the role of the fragmentation functions.