Search for leptonic charge asymmetry in $ t\overline{t}W $ production in final states with three leptons at $ \sqrt{s} $ = 13 TeV - INSPIRE

Search for leptonic charge asymmetry in $t\overline{t}W$ production in final states with three leptons at $\sqrt{s}$ = 13 TeV

ATLAS

Collaboration

Jan 10, 2023

48 pages

Published in:

JHEP 07 (2023) 033

Published: Jul 5, 2023

e-Print:

2301.04245 [hep-ex]

DOI:

10.1007/JHEP07(2023)033,
10.1007/jhep07(2023)033 (publication)

PDG:

{{\mathit t}}{{\overline{\mathit t}}}{{\mathit W}}

leptonic Charge Asymmetry (A

{}^{{{\mathit \ell}}}_{ C}

{{\mathit p}}{{\mathit p}}

\sqrt {s }

Report number:

CERN-EP-2022-249

Experiments:

CERN-LHC-ATLAS,
CERN-LHC-ATLAS

View in:

reference search15 citations

Citations per year

Abstract: (Springer)

A search for the leptonic charge asymmetry (

{A}_{\textrm{c}}^{\ell }

) of top-quark-antiquark pair production in association with a W boson (

t\overline{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 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}_{-0.003}^{+0.005}

(scale) ± 0.006 (MC stat.) and

-{0.063}_{-0.004}^{+0.007}

(scale) ± 0.004 (MC stat.) respectively, and in agreement with the measurements.[graphic not available: see fulltext]

Note:

48 pages in total, author list starting page 33, 11 figures, 5 tables, submitted to JHEP. All figures including auxiliary figures are available at: https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2020-27/

Hadron-Hadron Scattering
Top Physics
p p: scattering
p p: colliding beams
charge: asymmetry
top: pair production
W: associated production
perturbation theory: higher-order
higher-order: 1
numerical calculations: Monte Carlo

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