Transverse momentum distributions in low-mass Drell-Yan lepton pair production at NNLO QCD
R. Gauld, A. Gehrmann–De Ridder, T. Gehrmann, E. W. N. Glover, Alexander Huss, I. Májer, A. Rodriguez Garcia
Abstract
The production of lepton pairs at low invariant mass and finite transverse momentum resolves QCD dynamics at the boundary between the perturbative and non-perturbative domains. We investigate the impact of NNLO QCD corrections on these observables at energies corresponding to the BNL RHIC collider and to fixed-target experiments. Satisfactory perturbative convergence is observed in both cases. Only the collider data are found to be well-described by perturbative QCD, thus indicating the importance of non-perturbative effects in lepton-pair transverse momentum distributions at fixed target energies.
Topics & Concepts
PhysicsParticle physicsLeptonQuantum chromodynamicsPerturbative QCDInvariant massObservableNon-perturbativeNuclear physicsDrell–Yan processColliderPair productionPartonElectronQuantum mechanicsParticle physics theoretical and experimental studiesHigh-Energy Particle Collisions ResearchQuantum Chromodynamics and Particle Interactions