Speaker
Description
We will present the state-of-the-art full off-shell NLO QCD results for the $pp \to t\bar{t}W^+\, j+X$ process. The multi-lepton top-quark decay channel at the LHC with $\sqrt{s}= 13$ TeV will be analysed. In our calculation off-shell top quarks and gauge bosons are described by Breit-Wigner propagators. Furthermore, double-, single- as well as non-resonant top-quark contributions along with all interference effects are consistently incorporated already at the matrix element level. We will present the results at the integrated and differential cross-section level for various renormalisation and factorisation scale settings as well as different PDF sets. Lastly, we will investigate the effects of the additional jet activity in the $pp \to t\bar{t}W^+ +X$ process by comparing the normalised differential cross-section distributions for $pp \to e^+\nu_e\, \mu^-\bar{\nu}_\mu\, \tau^+\nu_\tau\, b\bar{b}\,j+X$ and $pp \to e^+\nu_e\, \mu^-\bar{\nu}_\mu\, \tau^+\nu_\tau\, b\bar{b} +X$.
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