SMuK 2023 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 72: Astroparticle Physics II

HK 72.4: Vortrag

Donnerstag, 23. März 2023, 16:30–16:45, SCH/A252

Photon identification and their uncertainties for the displaced production vertices in search for ALPs with ATLAS — Peter Krämer, Kristof Schmieden, Matthias Schott, and •Olivera Vujinović for the ATLAS collaboration — 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). Theoretical models allow a wide range of ALP-masses and couplings to SM particles such as photons and the Higgs boson. Therefore, parts of the ALP parameter space could be investigated with collider experiments like the ATLAS experiment at the LHC.

In this analysis, we search for the SM Higgs boson decaying into a pair of ALPs further decaying into two photons each. Depending on ALP properties such as mass and their coupling to photons, the signal is expected to form different final states, ranging from 2 to 4 photons, with a special focus on the photons originating from displaced vertices. This resulted in developing a dedicated approach in estimating the systematic uncertainties for this case. In this talk, the preliminary analysis results will be presented.