Isolated photon and photon+jet production at NNLO QCD accuracy
Xuan Chen, Thomas Gehrmann, Nigel Glover, Marius Höfer, Alexander Huss
Abstract
A bstract We describe the calculation of the next-to-next-to-leading order (NNLO) QCD corrections to isolated photon and photon-plus-jet production, and discuss how the experimental hadron-level photon definition and isolation criteria can be approximated in the theoretical parton-level calculation. The NNLO corrections lead to a considerable reduction of the theory uncertainty on the predictions, typically to less than five per cent, and enable an improved description of experimental measurements from ATLAS and CMS.
Topics & Concepts
PhysicsParticle physicsQuantum chromodynamicsPhotonEffective field theoryProduction (economics)Order (exchange)Quantum electrodynamicsFeynman graphPhoton structure functionSystematic errorReduction (mathematics)Nuclear physicsTwo-photon excitation microscopyLarge Hadron ColliderAtlas (anatomy)Pair productionParticle physics theoretical and experimental studiesHigh-Energy Particle Collisions ResearchParticle Detector Development and Performance