Gutschow, C;
Lindert, JM;
Schonherr, M;
(2018)
Multi-jet merged top-pair production including electroweak corrections.
The European Physical Journal C
, 78
(4)
, Article 317. 10.1140/epjc/s10052-018-5804-2.
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Abstract
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¯+jet production at the LHC considering the dominant NLO EW corrections of order O(α2sα) and O(α3sα) 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¯+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.
| Type: | Article |
|---|---|
| Title: | Multi-jet merged top-pair production including electroweak corrections |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1140/epjc/s10052-018-5804-2 |
| Publisher version: | https://doi.org/10.1140/epjc/s10052-018-5804-2 |
| Language: | English |
| Additional information: | This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. |
| Keywords: | Science & Technology, Physical Sciences, Physics, Particles & Fields, Physics, LOOP LEADING LOGARITHMS, ORDER QCD PREDICTIONS, B-TAGGED JETS, E-MU EVENTS, HADRON COLLIDERS, PP COLLISIONS, CROSS-SECTION, RADIATIVE-CORRECTIONS, DIPOLE SUBTRACTION, ATLAS DETECTOR |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10056782 |
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