SMuK 2023 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 72: Astroparticle Physics II

HK 72.5: Vortrag

Donnerstag, 23. März 2023, 16:45–17:00, SCH/A252

Neural network based identification of collimated photon pair signatures in a search for axions in SM Higgs boson decays with the ATLAS detector — •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 the ongoing analysis, we search for the SM Higgs boson decaying into a pair of ALPs further decaying into two photons each. For low mass ALPs, the decay photons can appear strongly collimated. These collimated photon pairs are reconstructed as a single photon only differing in the shape of the electromagnetic shower. In this talk it will be discussed how these collimated photon pair signatures can be identified using neural networks and how the corresponding uncertainties can be estimated.