Testing CP properties of extra Higgs states at the HL-LHC

Antusch, Stefan and Fischer, Oliver and Hammad, A. and Scherb, Christiane. (2021) Testing CP properties of extra Higgs states at the HL-LHC. Journal of High Energy Physics (3). p. 200.

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Official URL: https://edoc.unibas.ch/85920/

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Extra Higgs states appear in various scenarios beyond the current Standard Model of elementary particles. If discovered at the LHC or future colliders, the question will arise whether CP is violated or conserved in the extended scalar sector. An unambiguous probe of (indirect) CP violation would be the observation that one of the extra Higgs particles is an admixture of a CP-even and a CP-odd state. We discuss the possibility to discover scalar CP violation in this way at the high-luminosity (HL) phase of the LHC. We focus on the Two-Higgs Doublet Model of type I, where we investigate its currently allowed parameter region. Considering a benchmark point that is compatible with the current constraints but within reach of the HL-LHC, we study the prospects of determining the CP property of an extra neutral Higgs state H via the angular distribution of final states in the decay H ->tau(tau) over bar. The analysis is performed at the reconstructed level, making use of a Boosted Decision Tree for efficient signal-background separation and a shape analysis for rejecting a purely CP-even or odd nature of H.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Theoretische Physik (Antusch)
UniBasel Contributors:Antusch, Stefan and Hammad, Ahmed
Item Type:Article, refereed
Article Subtype:Research Article
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:12 Apr 2022 08:12
Deposited On:12 Apr 2022 08:12

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