Search for leptonic charge asymmetry in tt[bar]W production in final states with three leptons at √s = 13 TeV
A search for the leptonic charge asymmetry (Alc) of top-quark-antiquark pair production in association with a W boson (tt[bar]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...
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| Hauptverfasser: | , , , , , , , , , , , , , , , , , , , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
2023
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| In: |
Journal of high energy physics
Year: 2023, Heft: 7, Pages: 1-54 |
| ISSN: | 1029-8479 |
| DOI: | 10.1007/JHEP07(2023)033 |
| Online-Zugang: | Verlag, kostenfrei, Volltext: https://doi.org/10.1007/JHEP07(2023)033
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| Verfasserangaben: | The ATLAS collaboration* |
| Zusammenfassung: | A search for the leptonic charge asymmetry (Alc) of top-quark-antiquark pair production in association with a W boson (tt[bar]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 $$ -{0.084}_{-0.003}^{+0.005} $$(scale) ± 0.006 (MC stat.) and $$ -{0.063}_{-0.004}^{+0.007} $$(scale) ± 0.004 (MC stat.) respectively, and in agreement with the measurements. |
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| Beschreibung: | Veröffentlicht: 05. Juli 2023 *The ATLAS collaboration: G. Aad, L.M. Baltes, F. Bartels, F.L. Castillo, M.M. Czurylo, F. Del Rio, S.J. Dittmeier, M. Dunford, S. Franchino, T. Junkermann, M. Klassen, T. Mkrtchyan, P.S. Ott, D.F. Rassloff, S. Rodriguez Bosca, C. Sauer, A. Schoening, H.-C. Schultz-Coulon, V. Sothilingam, P. Starovoitov, L. Vigani, S.M. Weber, M. Wessels, J. Zinsser [und sehr viele weitere Personen] Im Titel steht der 2. Buchstabe "t" mit einem Oberstrich Im Titel steht der Buchstabe "s" unter dem Wurzelsymbol Gesehen am 17.11.2023 |
| Beschreibung: | Online Resource |
| ISSN: | 1029-8479 |
| DOI: | 10.1007/JHEP07(2023)033 |