Top Quark Asymmetries

Autor: Thorsten Chwalek, Frédéric Déliot
Jazyk: angličtina
Rok vydání: 2022
Předmět:
Zdroj: Universe, Vol 8, Iss 12, p 622 (2022)
Druh dokumentu: article
ISSN: 2218-1997
DOI: 10.3390/universe8120622
Popis: The production of top quark pairs (tt¯) 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 tt¯ 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 tt¯ events, the asymmetry of the tt¯ 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.
Databáze: Directory of Open Access Journals
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