Abstract
We complete our earlier study of the “direct” part of the cross section and spin asymmetry for the photoproduction process 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 at high transverse momentum . 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.
- Received 29 August 2017
DOI:https://doi.org/10.1103/PhysRevD.96.074026
© 2017 American Physical Society