The simplest of them all: $$ t\overline{t}{W}^{\pm } $$ at NLO accuracy in QCD

Bevilacqua, Giuseppe; Bi, Huan-Yu; Hartanto, Heribertus Bayu; Kraus, Manfred; Worek, Malgorzata

Abstract

Recent measurements of the pp → ttW¯ ± process in multi-lepton final states, as performed by the ATLAS collaboration in the context of the Higgs boson studies in the ttH¯ channel, have shown discrepancies between theoretical predictions and experimental data. Such discrepancies have been observed both in the overall normalisation as well as in the modelling of the ttW¯ ± process. With the goal of understanding and resolving the modelling issues within the SM ttW¯ ± process we report on the state-of-the-art NLO QCD computation for this process. Specifically, we calculate higher-order corrections to the e +νe µ −ν¯µ e +νe b ¯b and e −ν¯e µ +νµ e −ν¯e b ¯b final state at the LHC with √ s = 13 TeV. In the computation off-shell top quarks 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 at the matrix element level. Results at NLO QCD accuracy are presented in the form of fiducial integrated and differential cross sections for two selected renormalisation and factorisation scale choices and three different PDF sets. The impact of the top quark off-shell effects on the ttW¯ ± cross section is also examined by an explicit comparison to the narrow-width approximation.

Citation

Bevilacqua, G., Bi, H.-Y., Hartanto, H. B., Kraus, M., & Worek, M. (2020). The simplest of them all: $$ t\overline{t}{W}^{\pm } $$ at NLO accuracy in QCD. Journal of High Energy Physics, 2020(8), Article 043. https://doi.org/10.1007/jhep08%282020%29043

• Journal Article Type: Article
• Acceptance Date: Jul 11, 2020
• Online Publication Date: Aug 10, 2020
• Publication Date: 2020-08
• Deposit Date: Aug 18, 2020
• Publicly Available Date: Aug 18, 2020
• Journal: Journal of High Energy Physics
• Print ISSN: 1126-6708
• Publisher: Scuola Internazionale Superiore di Studi Avanzati (SISSA)
• Peer Reviewed: Peer Reviewed
• Volume: 2020
• Issue: 8
• Article Number: 043
• DOI: https://doi.org/10.1007/jhep08%282020%29043
• Public URL: https://durham-repository.worktribe.com/output/1258227