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Search for leptonic charge asymmetry in ttW¯ production in final states with three leptons at √s = 13 TeV ATLAS Collaboration
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.
Item Metadata
Title |
Search for leptonic charge asymmetry in ttW¯ production in final states with three leptons at √s = 13 TeV
|
Creator | |
Publisher |
Springer Berlin Heidelberg
|
Date Issued |
2023-07-05
|
Description |
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.
|
Subject | |
Genre | |
Type | |
Language |
eng
|
Date Available |
2023-09-15
|
Provider |
Vancouver : University of British Columbia Library
|
Rights |
Attribution 4.0 International (CC BY 4.0)
|
DOI |
10.14288/1.0435890
|
URI | |
Affiliation | |
Citation |
Journal of High Energy Physics. 2023 Jul 05;2023(7):33
|
Publisher DOI |
10.1007/JHEP07(2023)033
|
Peer Review Status |
Reviewed
|
Scholarly Level |
Faculty; Researcher
|
Copyright Holder |
The Author(s)
|
Rights URI | |
Aggregated Source Repository |
DSpace
|
Item Media
Item Citations and Data
Rights
Attribution 4.0 International (CC BY 4.0)