Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 5: Methods in particle physics 1 (e/gamma, SciFi)

T 5.3: Talk

Monday, March 4, 2024, 16:30–16:45, Geb. 20.30: 2.066

Photon identification and associated uncertainties for photons originating from displaced vertices in the search for ALPs with ATLAS — Peter Krämer, Kristof Schmieden, Matthias Schott, and •Olivera Vujinović — Johannes Gutenberg University, Mainz, Germany

Some puzzling questions in particle physics, such as the strong CP problem or the discrepancy of the muon magnetic moment could be solved by introducing light scalar or pseudo-scalar axion-like particles (ALPs). According to theoretical models, a wide range of ALP-masses and couplings to standard model (SM) particles, such as photons and Higgs bosons, is allowed. A large part of this parameter space can be probed by collider experiments.

In this analysis, conducted within the ATLAS experiment at the LHC, we search for the SM Higgs boson decaying into a pair of ALPs further decaying into two photons each, with a special focus on photons originating from the displaced vertices. This resulted in the development of a dedicated approach estimating the systematic uncertainties, taking into account the displaced origin of the photons from the primary vertex. In this talk, the final results of the analysis will be presented.

Keywords: axion, Higgs, photon, ATLAS