Search for leptonic charge asymmetry in tt¯ W production in final states with three leptons at √s = 13 TeV

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dc.contributor.authorAad, G.
dc.contributor.authorAbbott, B.
dc.contributor.authorAbbott, D.C.
dc.contributor.authorAbeling, K.
dc.contributor.authorAbidi, S.H.
dc.contributor.authorAboulhorma, A.
dc.contributor.authorAbramowicz, H.
dc.contributor.authorAbreu, H.
dc.contributor.authorAbulaiti, Y.
dc.contributor.authorAbusleme Hoffman, A.C.
dc.contributor.authorAcharya, B.S.
dc.contributor.authorAdam Bourdarios, C.
dc.contributor.authorAdamczyk, L.
dc.contributor.authorAdamek, L.
dc.contributor.authorAddepalli, S.V.
dc.contributor.authorAdelman, J.
dc.contributor.authorAdiguzel, A.
dc.contributor.authorAdorni, S.
dc.contributor.authorAdye, T.
dc.contributor.authorAffolder, A.A.
dc.contributor.authoret al.
dc.date.issued2023
dc.description.abstractA search for the leptonic charge asymmetry (A `c) of top-quark-antiquark pair production in association with a W boson (ttW¯ ) is presented. The search is performed using final states with exactly three charged light leptons (electrons or muons) and is based on √ s = 13 TeV proton-proton collision data collected with the ATLAS detector at the Large Hadron Collider at CERN during the years 2015–2018, corresponding to an integrated luminosity of 139 fb−1 . A profile-likelihood fit to the event yields in multiple regions corresponding to positive and negative differences between the pseudorapidities of the charged leptons from top-quark and top-antiquark decays is used to extract the charge asymmetry. At reconstruction level, the asymmetry is found to be −0.12 ± 0.14 (stat.) ± 0.05 (syst.). An unfolding procedure is applied to convert the result at reconstruction level into a charge-asymmetry value in a fiducial volume at particle level with the result of −0.11 ± 0.17 (stat.) ± 0.05 (syst.). The Standard Model expectations for these two observables are calculated using Monte Carlo simulations with next-to-leading-order plus parton shower precision in quantum chromodynamics and including next-to-leading-order electroweak corrections. They are −0.084 +0.005 −0.003 (scale) ± 0.006 (MC stat.) and −0.063 +0.007 −0.004 (scale) ± 0.004 (MC stat.) respectively, and in agreement with the measurements.
dc.description.statementofresponsibilityThe Atlas Collaboration … G. Aad … E. K. Filmer ... P. Jackson … A. X. Y. Kong ... H. Potti … E.X.L. Ting … M. J. White … et al.
dc.identifier.citationThe Journal of High Energy Physics, 2023; 2023(7):1-54
dc.identifier.doi10.1007/JHEP07(2023)033
dc.identifier.issn1029-8479
dc.identifier.urihttps://hdl.handle.net/2440/140241
dc.language.isoen
dc.publisherSpringer Science and Business Media LLC
dc.relation.grantARC
dc.rights© 2023 CERN for the benefit of the ATLAS Collaboration. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.
dc.source.urihttps://doi.org/10.1007/jhep07(2023)033
dc.subjectHadron-Hadron Scattering; Top Physics
dc.titleSearch for leptonic charge asymmetry in tt¯ W production in final states with three leptons at √s = 13 TeV
dc.typeJournal article
pubs.publication-statusPublished

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