Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 10: Search for New Particles -1

T 10.6: Vortrag

Montag, 21. März 2022, 17:30–17:45, T-H23

Categorizing final states and deriving limits on ALPs coupling to the SM Higgs boson in multiphoton events with ATLAS — Peter Krämer, Kristof Scmieden, 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). 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. 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. Each final state requires a dedicated approach to deriving the desired limits. In this talk it will be discussed which final states are expected, how they can be accessed and categorized.