Göttingen 2025 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 47: Axions/ALPs II

T 47.2: Vortrag

Mittwoch, 2. April 2025, 16:30–16:45, VG 0.110

Searching for ALPs through Photon Fusion at the Belle II experiment — •Frederik Schmitt, Giacomo De Pietro, Torben Ferber, and Alexander Heidelbach — Institute of Experimental Particle, Karlsruhe Institute of Technology, Karlsruhe, Germany

Axion-Like Particles (ALPs) represent an extension of the standard model and may serve as a portal to a dark sector. At the high-intensity e⁺e⁻ collider SuperKEKB, ALPs could be produced in direct e⁺e⁻ interactions. For low masses, ALPs are predominantly produced via vector-boson fusion. Focusing on primarily electroweak couplings, specifically to photons, an interesting decay arises with e⁺e⁻→ e⁺e⁻a,  a→γγ. This analysis investigates the sensitivity of Belle II for the given decay and its challenges which lie in the kinematic distribution of the final state particles - closely resembling radiative Bhabha-scattering. Considering the expectance of low lepton angles, the analysis considers 4 tag cases where either no, one positive/negative or both leptons are fully reconstructed. This talk will present the current status of the search and the complexities and advantages of each tag.

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