Higher-order corrections in $t\bar{t}\gamma$ cross sections

Abstract

We study higher-order QCD corrections for the associated production of a top-antitop quark pair and a photon ($t\bar{t}\gamma$ production) in proton-proton collisions. We calculate the approximate NNLO cross section, with second-order soft-gluon corrections added to the complete NLO 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.

10 pages, 4 figures, 1 table

References in corpus (22)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• Two-loop soft anomalous dimensions for single top quark associated production with a W- or H-
• Next-to-next-to-leading-order collinear and soft gluon corrections for t-channel single top quark production
• NNLL resummation for s-channel single top quark production
• Parton distributions from LHC, HERA, Tevatron and fixed target data: MSHT20 PDFs
• Next-to-next-to-leading soft-gluon corrections for the top quark cross section and transverse momentum distribution
• Single top quark production at the Tevatron: threshold resummation and finite-order soft gluon corrections
• Two-loop soft anomalous dimensions and NNLL resummation for heavy quark production
• Observation of top-quark pair production in association with a photon and measurement of the $t\bar{t}\gamma$ production cross section in pp collisions at $\sqrt{s}=7$ TeV using the ATLAS detector
• NNNLO soft-gluon corrections for the top-antitop pair production cross section
• Soft anomalous dimensions for single-top production at three loops
• Measurement of the semileptonic tt-bar gamma production cross section in pp collisions at sqrt(s) = 8 TeV
• Automated EW corrections with isolated photons: $t\bar{t}\gamma$, $t\bar{t}\gamma \gamma$ and $t\gamma j$ as case studies
• Measurement of the $t\bar{t}\gamma$ production cross section in proton-proton collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
• Measurements of inclusive and differential cross-sections of combined $t\bar{t}\gamma$ and $tW\gamma$ production in the $e\mu$ channel at 13 TeV with the ATLAS detector
• Electroweak corrections to top quark pair production in association with a hard photon at hadron colliders
• Soft-gluon corrections for the associated production of a single top quark and a Higgs boson
• The top quark charge asymmetry in $t\bar{t}\gamma$ production at the LHC
• QCD corrections in $tq\gamma$ production at hadron colliders
• Measurement of the inclusive and differential $\mathrm{t}\bar{\mathrm{t}}\gamma$ cross sections in the dilepton channel and effective field theory interpretation in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Soft anomalous dimensions and resummation in QCD
• Soft-gluon corrections for $tqZ$ production

Cited by in corpus (8)

• Complete NLO corrections to top-quark pair production with isolated photons
• Linear power corrections to top quark pair production in hadron collisions
• Soft-gluon corrections in $t\bar{t}W$ production
• SMEFT chromomagnetic dipole operator contributions to $t\bar{t}$ production at approximate NNLO in QCD
• NLO QCD predictions for $\mathbf{t}\bar{\mathbf{t}}\mathbf{\gamma }$ with realistic photon isolation
• Resummation for $s$-channel single-top production
• Higher-order QCD and electroweak corrections for $t\bar{t}H$ production
• One-loop amplitudes for $t\bar{t}j$ and $t\bar{t}\gamma$ productions at the LHC through $\mathcal{O}({\epsilon }^2)$