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| Home > Publications database > Search for leptonic charge asymmetry in $t\bar{t}W$ production in final states with three leptons at $\sqrt{s} = 13$ TeV |
| Report | PUBDB-2022-07036 |
2022
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Please use a persistent id in citations: doi:10.3204/PUBDB-2022-07036
Report No.: ATLAS-CONF-2022-062
Abstract: A search for the leptonic charge asymmetry ($A_{c}^{\ell}$) of top-quark-antiquark pair production in association with a $W$ boson ($t\bar{t}W$) is presented. The search is performed using final states with exactly three charged light leptons (electrons or muons) and is based on $\sqrt{s} = 13$ 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 reconstructed level, the asymmetry is found to be $-0.123 \pm 0.136$ (stat.) $\pm \, 0.051$ (syst.). An unfolding procedure is applied to convert the result at reconstructed level into a charge-asymmetry value in a fiducial volume at particle level with the result of $-0.112 \pm 0.170$ (stat.) $\pm \, 0.055$ (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) $\pm\, 0.006$ (MC stat.) and $-0.063 \, ^{+0.007}_{-0.004}$ (scale) $\pm\, 0.004$ (MC stat.), respectively.
Keyword(s): p p: colliding beams ; charge: asymmetry ; top: pair production ; W: associated production ; perturbation theory: higher-order ; higher-order: 1 ; numerical calculations: Monte Carlo ; parton: showers ; electroweak interaction: correction ; p p: scattering ; final state: ((n)jet 3lepton) ; muon ; quantum chromodynamics: perturbation theory ; CERN Lab ; electron ; CERN LHC Coll ; rapidity ; ATLAS ; data analysis method ; experimental results ; 13000 GeV-cms ; ttW ; ttV ; charge asymmetry ; unfolding ; top+X
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