Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 28: Search for new particles 3 (ALPS)

T 28.7: Talk

Tuesday, March 5, 2024, 17:30–17:45, Geb. 20.30: 1.067

Searching for axion like particles in the H->Za->llyy decay with ATLAS — •Georgios Lamprinoudis — Johannes Gutenberg Universitat Mainz

Axion-like particles (ALPs) are motivated by numerous theoretical models, including the two-Higgs-doublet model (2HDM). ALPs can couple to the Higgs and Z bosons via a 5-dim effective coupling and may decay to photons. Depending on the axion -- photon coupling ALPs can have a significant life-time which may lead to displaced decay vertices. While previous analyses assumed a negligible axion lifetime, a finite lifetime with displaced vertex signatures is studied in the present analysis of the h->Za->2l2y channel. The analysis covers a mass range of the axions from 1 GeV to 33 GeV. In the case that no signal is observed, the analysis will establish upper limits on the axion-Higgs-Z coupling.

Keywords: Axions; ATLAS; Higgs; vertex; displaced