https://doi.org/10.1140/epjc/s10052-018-5804-2
Regular Article - Theoretical Physics
Multi-jet merged top-pair production including electroweak corrections
1
Department of Physics and Astronomy, University College London, Gower Street, London, WC1E 6BT, UK
2
Department of Physics, Institute for Particle Physics Phenomenology, Durham University, Durham, DH1 3LE, UK
3
Theoretical Physics Department, CERN, 1211, Geneva 23, Switzerland
* e-mail: jonas.lindert@gmail.com
Received:
15
March
2018
Accepted:
11
April
2018
Published online:
19
April
2018
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 
and 
production at the LHC considering the dominant NLO EW corrections of order 
and 
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 and . 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.
© The Author(s), 2018
