Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 28: Search for new particles 3 (ALPS)

T 28.3: Talk

Tuesday, March 5, 2024, 16:30–16:45, Geb. 20.30: 1.067

Search for ALPs in e⁺e⁻→γ a, a→γγ at Belle II — •Alexander Heidelbach, Giacomo De Pietro, Torben Ferber, and Pablo Goldenzweig — Institute of Experimental Particle Physics (ETP), Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany

Axion-Like Particles (ALPs), predicted by theoretical extensions of the Standard Model, represent potential Dark Matter mediators. The Belle II collaboration is conducting a search for the e⁺e⁻→γ a channel, with subsequent ALP decay into a photon pair. This study utilizes the Belle II detectors precision, high luminosity, and unique understanding of the initial state to explore a diverse range of ALP masses and couplings in this fully neutral three-photon final state. Compared to the predecessor analysis based on the 2018 dataset, this analysis uses around 1000 times larger dataset, an improved understanding of the photon reconstruction resolution, and an MVA-based candidate selection. This talk will discuss the current state of the new analysis

Keywords: Axion Like Particle; Analysis; New Physics; Physics Beyond the Standard Model; Belle II