Higher-order corrections in t t ¯ γ cross sections
Department
Physics
Document Type
Article
Publication Date
2-1-2023
Abstract
We study higher-order QCD corrections for the associated production of a top-antitop quark pair and a photon (tt¯γ production) in proton-proton collisions. We calculate the approximate next-to-next-to-leading order cross section, with second-order soft-gluon corrections added to the complete next-to-leading order result, including uncertainties from scale dependence and from parton distributions. We compare our results to recent measurements from the LHC, and find that the soft-gluon corrections provide improved agreement with the data. We also calculate differential distributions in top-quark transverse momentum and rapidity.
Journal Title
Physical Review D
Journal ISSN
24700010
Volume
107
Issue
3
Digital Object Identifier (DOI)
10.1103/PhysRevD.107.034013
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