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HK: Fachverband Physik der Hadronen und Kerne

HK 51: Fundamental Symmetries III

HK 51.4: Talk

Wednesday, March 22, 2023, 19:00–19:15, SCH/A252

Search for axion-like particles from Higgs boson decays in the 4 electron final state using the ATLAS detector — •Georgios Lamprinoudis, Matthias Schott, and Kristof Schmeiden for the ATLAS collaboration — Johannes Gutenberg Universitat Mainz

Axion-like particles (ALPs) are motivated by numerous theoretical models, including the two-Higgs-doublet model (2HDM). ALPs can also couple to the Higgs boson and may decay to leptons. The coupling of ALPs to leptons defines their life-time and hence might lead to displaced decay vertices in the detector. While previous analyses assumed a negligible axion lifetime, a finite lifetime with displaced vertex signatures is studied in the present analysis of the h->aa->4e channel. The analysis covers a mass range of the axions from 0.5 GeV to 60 GeV. In the case that no signal is observed, the analysis will establish upper limits on the axion-Higgs coupling.