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Predictions for off-shell $t\bar{t}Z$ production at the LHC: the complete set of LO and NLO contributions

Daniele Lombardi

Abstract

We present predictions for the production and decay of a top--antitop pair in association with a Z boson in the multi-lepton decay channel at the LHC. Our results include the complete set of LO and NLO contributions. Since our calculation is based on full matrix elements, off-shell effects are entirely taken into account. Integrated and differential cross-sections are reported for a realistic fiducial setup.

Predictions for off-shell $t\bar{t}Z$ production at the LHC: the complete set of LO and NLO contributions

Abstract

We present predictions for the production and decay of a top--antitop pair in association with a Z boson in the multi-lepton decay channel at the LHC. Our results include the complete set of LO and NLO contributions. Since our calculation is based on full matrix elements, off-shell effects are entirely taken into account. Integrated and differential cross-sections are reported for a realistic fiducial setup.

Paper Structure

This paper contains 7 sections, 1 equation, 2 figures, 1 table.

Table of Contents

  1. Introduction
  2. Outline of the calculation
  3. Results
  4. Integrated cross-sections
  5. Differential cross-sections
  6. Conclusion
  7. Funding information

Figures (2)

  • Figure 1: Perturbative orders contributing at LO and NLO for the process in Eq. (\ref{['eq:procdef']}).
  • Figure 2: Distributions in the transverse momentum of the bottom-jet pair (left) and in the invariant mass of the $\tau^+\tau^-$ pair (right). The different NLO corrections for the observables are compared separately (first ratio panels) and at the level of the full prediction (second ratio panel). The size of photon-induced channels and bottom contributions are presented in the third and fourth ratio panels, respectively. See Ref. Lombardi:2024owo.