Search for leptonic charge asymmetry in <i>t</i>(<i>t</i>)over-barW production in final states with three leptons at √<i>s</i>=13 TeV



Aad, G, Abbott, B, Abbott, DC, Abud, A Abed, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H
et al (show 2887 more authors) (2023) Search for leptonic charge asymmetry in <i>t</i>(<i>t</i>)over-barW production in final states with three leptons at √<i>s</i>=13 TeV. JOURNAL OF HIGH ENERGY PHYSICS, 2023 (7). 33-.

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Abstract

<jats:title>A<jats:sc>bstract</jats:sc> </jats:title><jats:p>A search for the leptonic charge asymmetry (<jats:inline-formula><jats:alternatives><jats:tex-math>$$ {A}_{\textrm{c}}^{\ell } $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>A</mml:mi> <mml:mi>c</mml:mi> <mml:mi>ℓ</mml:mi> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula>) of top-quark-antiquark pair production in association with a <jats:italic>W</jats:italic> boson (<jats:inline-formula><jats:alternatives><jats:tex-math>$$ t\overline{t}W $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>t</mml:mi> <mml:mover> <mml:mi>t</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> <mml:mi>W</mml:mi> </mml:math></jats:alternatives></jats:inline-formula>) is presented. The search is performed using final states with exactly three charged light leptons (electrons or muons) and is based on <jats:inline-formula><jats:alternatives><jats:tex-math>$$ \sqrt{s} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math></jats:alternatives></jats:inline-formula> = 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<jats:sup><jats:italic>−</jats:italic>1</jats:sup>. 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<jats:italic>.</jats:italic>12 ± 0<jats:italic>.</jats:italic>14 (stat.) ± 0<jats:italic>.</jats:italic>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<jats:italic>.</jats:italic>11 ± 0<jats:italic>.</jats:italic>17 (stat.) ± 0<jats:italic>.</jats:italic>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 <jats:inline-formula><jats:alternatives><jats:tex-math>$$ -{0.084}_{-0.003}^{+0.005} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mo>−</mml:mo> <mml:msubsup> <mml:mn>0.084</mml:mn> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>0.003</mml:mn> </mml:mrow> <mml:mrow> <mml:mo>+</mml:mo> <mml:mn>0.005</mml:mn> </mml:mrow> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula> (scale) <jats:italic>±</jats:italic> 0<jats:italic>.</jats:italic>006 (MC stat.) and <jats:inline-formula><jats:alternatives><jats:tex-math>$$ -{0.063}_{-0.004}^{+0.007} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mo>−</mml:mo> <mml:msubsup> <mml:mn>0.063</mml:mn> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>0.004</mml:mn> </mml:mrow> <mml:mrow> <mml:mo>+</mml:mo> <mml:mn>0.007</mml:mn> </mml:mrow> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula> (scale) <jats:italic>±</jats:italic> 0<jats:italic>.</jats:italic>004 (MC stat.) respectively, and in agreement with the measurements.</jats:p>

Item Type: Article
Uncontrolled Keywords: Hadron-Hadron Scattering, Top Physics
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 25 Jul 2023 14:26
Last Modified: 18 Mar 2024 03:57
DOI: 10.1007/JHEP07(2023)033
Open Access URL: https://link.springer.com/article/10.1007/JHEP07(2...
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3171905