Dortmund 2021 – scientific programme
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T: Fachverband Teilchenphysik
T 12: Search for New Particles I
T 12.4: Talk
Monday, March 15, 2021, 16:50–17:05, Tl
Estimation of reconstruction and trigger efficiencies in search for ALPs in Higgs boson decays at the LHC with ATLAS — Bernard Brickwedde, Peter Krämer, Marten Mildeberger, Kristof Schmieden, Matthias Schott, and •Olivera Vujinovic — 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). ALPs may be produced at the Large Hadron Collider in Higgs decays. They further decay into a pair of photons (H→ aa→ 4γ). Depending on the ALP mass, the final photon-pairs will be reconstructed either as one (merged) photon or as two resolved photons. An artificial neural network (ANN) is used to identify merged photons amongst the immense background from prompt photons and π 0 from SM processes. Our analysis is using data collected at LHC within the ATLAS experiment. This talk will give an overview of the analysis’s strategy to probe the ALP mass-coupling parameter space, including the preliminary estimations of the acceptance, reconstruction and trigger efficiencies using simulated Monte Carlo signal samples. The decay length of the ALPs is non-negligible and has a significant impact on the experimental acceptance, which will be discussed as well.