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Top Quark Asymmetries

Chwalek, Thorsten 1; Déliot, Frédéric
1 Institut für Experimentelle Teilchenphysik (ETP), Karlsruher Institut für Technologie (KIT)

Abstract:

The production of top quark pairs (t$\overline{t}$) via the quark-antiquark initial state is not symmetric under the exchange of top quark and antiquark. Calculations of this next-to-leading order effect predict asymmetries of about one to a few percent, depending on the centre-of-mass energy and the selected phase space. Experimentally, this charge asymmetry of t$\overline{t}$ production manifests itself in differences in angular distributions between top quarks and antiquarks. Sensitive observables are the rapidities of the produced top quarks and antiquarks as well as their energies. In dileptonic t$\overline{t}$ events, the asymmetry of the t$\overline{t}$ system is reflected in a similar asymmetry in the system of the produced lepton pair, with the crucial advantage of a simpler reconstruction procedure. In this article we review the measurements of this effect in different final states and using different observables by the ATLAS and CMS Collaborations in LHC collisions at three different centre-of-mass energies.


Verlagsausgabe §
DOI: 10.5445/IR/1000155072
Veröffentlicht am 25.01.2023
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Experimentelle Teilchenphysik (ETP)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 12.2022
Sprache Englisch
Identifikator ISSN: 2218-1997
KITopen-ID: 1000155072
Erschienen in Universe
Verlag MDPI
Band 8
Heft 12
Seiten Art.Nr. 622
Vorab online veröffentlicht am 25.11.2022
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