# Heavy scalars aim for the top in the ATLAS experiment

- Institution: CERN
- Department: LHC Seminar
- Speaker: Janna Katharina Behr
- Year: 2024
- Language: English
- Source: [CERN](https://videos.cern.ch/record/3019846)
- Licence: [CERN](http://copyright.web.cern.ch)
- Who can watch: Teens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

New massive scalar or pseudo-scalar states with strong couplings to the top quark are predicted in numerous extensions of the Standard Model. These include models with an extended Higgs sector, such as Two-Higgs-Doublet Models (2HDMs). In this seminar, three recent searches for new scalar and pseudo-scalar particles with couplings to the top quark using the full Run-2 dataset are presented. Final states with two, three or four top quarks, targeting production of the heavy Higgs-like states via gluon-gluon fusion (gg→A/H), associated production with a top-quark (tA/H) or with a top-antitop-quark pair (tt̄A/H), as well as the t-channel production resulting in a same-sign top-quark pair are considered. The gg→A/H→tt̄ search takes into account interference with the SM process and provides the first full Run-2 search of this kind at the LHC. Searches in final states with more than two top quarks make use of neural networks, and provide the first collider result in a general 2HDM, with the heavy scalar featuring flavour changing couplings, including the first dedicated search featuring three top quarks.

Refreshments will be served at 10:30 .

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## Lectures

1. [Heavy scalars aim for the top in the ATLAS experiment](https://invisiblenetwork.ai/learn/cern/3019846/6a5b92e44981), 56 min (CERN's player)