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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Search for leptonic charge asymmetry in tt¯ W production in final states with three leptons at √s = 13 TeV
AU - The ATLAS collaboration
AU - Barton, A.E.
AU - Bertram, I.A.
AU - Borissov, G.
AU - Bouhova-Thacker, E.V.
AU - Ferguson, Ruby
AU - Fox, H.
AU - Henderson, R.C.W.
AU - Jones, R.W.L.
AU - Kartvelishvili, V.
AU - Love, P.A.
AU - Marshall, Emma
AU - Meng, L.
AU - Muenstermann, D.
AU - Ribaric, Neza
AU - Rybacki, K.
AU - Smizanska, M.
AU - Spinali, S.
AU - Wharton, A.M.
AU - Yexley, Melissa
PY - 2023/7/5
Y1 - 2023/7/5
N2 - A search for the leptonic charge asymmetry (Aℓc) of top-quark-antiquark pair production in association with a W boson (tt¯W) 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.
AB - A search for the leptonic charge asymmetry (Aℓc) of top-quark-antiquark pair production in association with a W boson (tt¯W) 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.
U2 - 10.1007/JHEP07(2023)033
DO - 10.1007/JHEP07(2023)033
M3 - Journal article
VL - 2023
JO - Journal of High Energy Physics
JF - Journal of High Energy Physics
SN - 1029-8479
IS - 7
M1 - 33
ER -