2018/03/02 by Christian Gütschow, C. Gütschow, Jonas M. Lindert +1
Computer Science · Physics and Astronomy · #Computational Physics and Python Applications #Electron #Electroweak interaction #High-Energy Particle Collisions Research #Jet (fluid) #Large Hadron Collider #Lepton #Nuclear physics #Order (exchange) #Pair production #Particle physics #Particle physics theoretical and experimental studies #Parton #Parton shower #Physics #Physics beyond the Standard Model #Production (economics) #Quantum chromodynamics #Top quark #hep-ex #hep-ph
paper · pdf · doi:10.1140/epjc/s10052-018-5804-2
10 pages, 5 figures
arxiv created 2018/03/02 · openalex publication_date 2018/04/01 · arxiv updated 2018/05/09 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We present theoretical predictions for the production of top-quark pairs in association with jets at the LHC including electroweak (EW) corrections. First, we present and compare differential predictions at the fixed-order level for tt and tt+\text jet production at the LHC considering the dominant NLO EW corrections of order \mathcal O(α _\mathrm s2 α ) and \mathcal O(α _\mathrm s3 α ) respectively together with all additional subleading Born and one-loop contributions. The NLO EW corrections are enhanced at large energies and in particular alter the shape of the top transverse momentum distribution, whose reliable modelling is crucial for many searches for new physics at the energy frontier. Based on the fixed-order results we motivate an approximation of the EW corrections valid at the percent level, that allows us to readily incorporate the EW corrections in the MePs@Nlo framework of Sherpa combined with OpenLoops. Subsequently, we present multi-jet merged parton-level predictions for inclusive top-pair production incorporating NLO QCD + EW corrections to tt and tt+\text jet . Finally, we compare at the particle-level against a recent 8 TeV measurement of the top transverse momentum distribution performed by ATLAS in the lepton + jet channel. We find very good agreement between the Monte Carlo prediction and the data when the EW corrections are included.