Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 54: Axion like particles I

T 54.4: Talk

Wednesday, April 1, 2020, 17:15–17:30, H-HS XV

Search for Axion-Like Particles in early Belle II data — •Michael De Nuccio for the Belle II collaboration — DESY, Hamburg, Germany

The Belle II experiment, located at the asymmetric e⁺e⁻ collider SuperKEKB in Tsukuba, Japan, is a second-generation B factory. A first commissioning run took place in Spring 2018. The main physics data taking began in early 2019. Thanks to the very clean environment and dedicated triggers, Belle II is suited to perform searches for dark-sector particles.

Axion-Like Particles (ALPs) are light, neutral pseudoscalars interacting predominantly with Standard Model photons, and have been proposed both as candidate dark matter particles or as portal particles to the dark sector. The Belle II sensitivity to ALPs produced in association with a recoil photon from e⁺e⁻ collisions, and decaying promptly into two photons, is competitive with the small commissioning collisions dataset collected in 2018. This talk will present the results of this search, and will show the new limits that the Belle II experiment is able to set for this process.