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NLO QCD corrections to off-shell top-antitop production with leptonic decays at hadron colliders

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arxiv 1207.5018 v2 pith:DTWLUQE6 submitted 2012-07-20 hep-ph

Ansgar Denner (Wurzburg U.) , Stefan Dittmaier (Freiburg U.) , Stefan Kallweit (Zurich U.) , Stefano Pozzorini (Zurich U.) This is my paper · ORCID
classification hep-ph
keywords crossoff-shellproductionsectioncalculationdecaysdistributionseffects
verification ladder T0 review T1 audit T2 compute T3 formal
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We present details of a calculation of the cross section for hadronic top-antitop production in next-to-leading order (NLO) QCD, including the decays of the top and antitop into bottom quarks and leptons. This calculation is based on matrix elements for \nu e e+ \mu- \bar{\nu}_{\mu}b\bar{b} production and includes all non-resonant diagrams, interferences, and off-shell effects of the top quarks. Such contributions are formally suppressed by the top-quark width and turn out to be small in the inclusive cross section. However, they can be strongly enhanced in exclusive observables that play an important role in Higgs and new-physics searches. Also non-resonant and off-shell effects due to the finite W-boson width are investigated in detail, but their impact is much smaller than naively expected. We also introduce a matching approach to improve NLO calculations involving intermediate unstable particles. Using a fixed QCD scale leads to perturbative instabilities in the high-energy tails of distributions, but an appropriate dynamical scale stabilises NLO predictions. Numerical results for the total cross section, several distributions, and asymmetries are presented for Tevatron and the LHC at 7 TeV, 8 TeV, and 14 TeV.

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Cited by 4 Pith papers

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  1. Towards NNLO QCD predictions for off-shell top-quark pair production and decays

    hep-ph 2025-07 conditional novelty 8.0 of 10

    The first NNLO QCD prediction for off-shell W+W-bbbar production with massive bottom quarks at the LHC, using a double-pole approximation for the two-loop virtual and an on-shell matching for non-factorisable corrections.

  2. Complete NLO corrections to off-shell $\boldsymbol{t\bar{t}}$ production in the $\boldsymbol{\ell+j}$ decay channel

    hep-ph 2025-12 unverdicted novelty 7.0 of 10

    First complete NLO QCD+EW predictions for off-shell ttbar production in the lepton+jets channel, including all subleading Born and NLO terms and an IR-safe photon-jet treatment, at 13.6 TeV.

  3. SMEFT everywhere: a NLO study of $\boldsymbol{pp \to t\bar{t}H}$ with decaying tops

    hep-ph 2026-05 unverdicted novelty 6.0 of 10

    NLO QCD corrections to pp to ttbar H in the di-lepton channel with SMEFT operators included in both production and top-quark decays.

  4. On the ratio of $t\bar{t}\gamma$ and $t\bar{t}$ cross sections at the LHC

    hep-ph 2019-06 unverdicted novelty 5.0 of 10

    Computes the ratio of ttgamma/tt cross sections at LHC Run II with NLO QCD including off-shell effects, quantifying reduced theoretical uncertainties from correlations.

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