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

ATLAS Publications, T.M. Carter, R.Y. Gonzalez Andana, A. Hasib, M.P. Heath, V.A. Parrish, E.A. Pender, E.P. Takeva, N. Themistokleous, E.M. Villhauer, E. Zaid

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

A search for the leptonic charge asymmetry (A`c) of top-quark-antiquark pair
production in association with a W boson (t¯tW ) 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.
Original languageEnglish
Article number33
Pages (from-to)1-53
Number of pages53
Journal Journal of High Energy Physics
Issue number7
Publication statusPublished - 5 Jul 2023

Keywords / Materials (for Non-textual outputs)

  • Hadron-Hadron Scattering
  • Top Physics


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