Göttingen 2025 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

T: Fachverband Teilchenphysik

T 47: Axions/ALPs II

T 47.3: Vortrag

Mittwoch, 2. April 2025, 16:45–17:00, VG 0.110

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

Axion-Like Particles (ALPs), predicted by theoretical extensions of the Standard Model, represent potential Dark Matter mediators. We are searching for the e⁺e⁻→γ a channel, with subsequent ALP decay into a photon pair, at the Belle II experiment. This study utilizes the Belle II detector’s precision, the SuperKEKB collider’s high luminosity, and a 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 targets an around 1000 times larger dataset, an improved understanding of the photon reconstruction resolution, kinematic fits to the initial state, and an MVA-based candidate selection. This talk will discuss the current state of the new analysis.

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