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Multi-jet merged top-pair production including electroweak corrections

Gütschow, Christian; Lindert, Jonas M.; Schoenherr, M

Multi-jet merged top-pair production including electroweak corrections Thumbnail


Christian Gütschow

Jonas M. Lindert


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.


Gütschow, C., Lindert, J. M., & Schoenherr, M. (2018). Multi-jet merged top-pair production including electroweak corrections. The European Physical Journal C, 78(4), Article 317.

Journal Article Type Article
Acceptance Date Apr 11, 2018
Online Publication Date Apr 19, 2018
Publication Date Apr 19, 2018
Deposit Date May 3, 2018
Publicly Available Date May 3, 2018
Journal European Physical Journal C: Particles and Fields
Print ISSN 1434-6044
Electronic ISSN 1434-6052
Publisher SpringerOpen
Peer Reviewed Peer Reviewed
Volume 78
Issue 4
Article Number 317


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Copyright Statement
© The Author(s) 2018 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (, 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. Funded by SCOAP3.

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