Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/140241
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Type: | Journal article |
Title: | Search for leptonic charge asymmetry in tt¯ W production in final states with three leptons at √s = 13 TeV |
Author: | Aad, G. Abbott, B. Abbott, D.C. Abeling, K. Abidi, S.H. Aboulhorma, A. Abramowicz, H. Abreu, H. Abulaiti, Y. Abusleme Hoffman, A.C. Acharya, B.S. Adam Bourdarios, C. Adamczyk, L. Adamek, L. Addepalli, S.V. Adelman, J. Adiguzel, A. Adorni, S. Adye, T. Affolder, A.A. et al. |
Citation: | The Journal of High Energy Physics, 2023; 2023(7):1-54 |
Publisher: | Springer Science and Business Media LLC |
Issue Date: | 2023 |
ISSN: | 1029-8479 1029-8479 |
Statement of Responsibility: | The Atlas Collaboration … G. Aad … E. K. Filmer ... P. Jackson … A. X. Y. Kong ... H. Potti … E.X.L. Ting … M. J. White … et al. |
Abstract: | A 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. |
Keywords: | Hadron-Hadron Scattering; Top Physics |
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. |
DOI: | 10.1007/JHEP07(2023)033 |
Grant ID: | ARC |
Published version: | http://dx.doi.org/10.1007/jhep07(2023)033 |
Appears in Collections: | Physics publications |
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File | Description | Size | Format | |
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hdl_140241.pdf | Published version | 1.54 MB | Adobe PDF | View/Open |
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