Regular Article - Theoretical Physics
Precision studies for Drell–Yan processes at NNLO
II. Institut für Theoretische Physik, Universität Hamburg, Luruper Chaussee 149, 22761, Hamburg, Germany
2 Institute for High Energy Physics, 142281, Protvino, Moscow Region, Russia
3 Department of Experimental Physics, University of Debrecen, PO Box 105, 4010, Debrecen, Hungary
4 ELKH-DE Particle Physics Research Group, University of Debrecen, PO Box 105, 4010, Debrecen, Hungary
5 Institute for Theoretical Physics, ELTE Eötvös Loránd University, Pázmány Péter 1/A, 1117, Budapest, Hungary
Accepted: 17 June 2021
Published online: 3 July 2021
We present a detailed comparison of the fixed-order predictions computed by four publicly available computer codes for Drell–Yan processes at the LHC and Tevatron colliders. We point out that while there is agreement among the predictions at the next-to-leading order accuracy, the predictions at the next-to-next-to-leading order (NNLO) differ, whose extent depends on the observable. The sizes of the differences in general are at least similar, sometimes larger than the sizes of the NNLO corrections themselves. We demonstrate that the neglected power corrections by the codes that use global slicing methods for the regularization of double real emissions can be the source of the differences. Depending on the fiducial cuts, those power corrections become linear, hence enhanced as compared to quadratic ones that are considered standard.
© The Author(s) 2021
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