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Gauld, R.; Gehrmann–De Ridder, A.; Gehrmann, T.; Glover, E.W.N.; Huss, A.; Majer, I.; Rodriguez Garcia, A.
Physics letters. B, 06/2022, Letnik: 829Journal Article
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.
