Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 54: Axion like particles I

T 54.3: Talk

Wednesday, April 1, 2020, 17:00–17:15, H-HS XV

Search for Axion-Like Particles at BESIII — •Julian Walter, Achim Denig, and Christoph Florian Redmer for the BESIII collaboration — Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, Deutschland

Axions or axion-like particles (ALPs) are hypothetical elementary particles proposed by theoretical approaches to extend the Standard Model of particle physics. While initially postulated as a solution to the strong CP problem of Quantum Chromodynamics, the existence of such a particle a could contribute to our understanding of other unsolved problems of modern particle physics. One such example is the anomalous magnetic moment of the muon a_µ, where the experimentally measured value deviates from the theoretical prediction by 3−4σ. Furthermore, ALPs are considered promising candidates for cold Dark Matter.

The BESIII experiment at the BEPCII e⁺e⁻ collider in Beijing, China, offers a great opportunity to investigate the possible production of ALPs in two-photon fusion reactions, assuming a subsequent decay a → γ γ. This contribution will present a feasibility study of such investigations — Supported by DFG SFB 1044.