Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 28: Search for new particles 3 (ALPS)

T 28.8: Talk

Tuesday, March 5, 2024, 17:45–18:00, Geb. 20.30: 1.067

Multivariate photon classification for an axion-like particle (ALP) search in Higgs boson decays at the ATLAS experiment — •Peter Krämer, Kristof Schmieden, Matthias Schott, and Olivera Vujinović — Johannes Gutenberg Universität Mainz

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.

For low mass ALPs, the decay photons can appear strongly collimated. These collimated photon pairs are reconstructed as a single photon. In this talk it will be discussed how multivariate classification techniques can be applied on detector level information to identify these collimated photons.

Keywords: Neural Network; ALP; Photons; Higgs boson; ATLAS