Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 54: Axion like particles I

T 54.9: Talk

Wednesday, April 1, 2020, 18:30–18:45, H-HS XV

The search for axion-like particles within A2 — •Daniel Maurer, Achim Denig, and Lena Heijkenskjöld for the A2 collaboration — Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, Deutschland

A special type of hypothetical pseudo-scalar particles has been postulated in Standard Model extensions to solve the strong CP problem, the so-called axion-like particle (ALP). Additionally, they might be a solution for the puzzle of the anomalous magnetic moment of the muon, as well as a candidate for cold dark matter. By considering ALPs to be dominantly coupling to photons, they can be produced in Primakoff production off a nuclear target, in t-channel photon exchange, and can be searched for in two photon final states.

In this presentation, we discuss a feasibility study of the possibility to detect ALPs within the CB/TAPS setup of the A2 collaboration at MAMI. The experiment uses a Bremstrahlung distributed photon beam with E_max=1492 MeV impinging on a fixed target, along with a system of detectors that nearly covers the full solid angle for high precision nuclear experiments. A simulation of the fixed-target particle interaction γ p → a p → γγ p is performed, accounting for a Bremsstrahlung distribution of the incident photon beam together with the Primakoff doubly-differential cross section. The resulting kinematical distributions of the final state particles are investigated to determine the acceptance of the CB/TAPS detector system.

—Supported by DFG SFB1044.