SMuK 2023 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 48: Hadron Structure and Spectroscopy V
HK 48.2: Vortrag
Mittwoch, 22. März 2023, 17:45–18:00, SCH/A316
Search for J/ψ → p p e+ e− decays at the BESIII experiment — •Saskia Plura, Achim Denig, and Christoph Florian Redmer for the BESIII collaboration — Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, Deutschland
In 2016, the ATOMKI collaboration proposed the existence of a new neutral boson with a mass of 17 MeV to explain their observation of a significant enhancement in the angular correlations of e+ e− pairs in nuclear transitions of 8Be and 4He. This new particle, referred to as the X17 boson, sparked interest in the particle physics community.
As the X17 should couple to nucleons, the decay J/ψ → p p e+ e− has been selected as a potential channel for X17 searches, where the (anti-)proton radiates off an X17, which subsequently decays to an e+ e− pair. The concurrent QED process offers the possibility to measure the timelike proton form factor in the unphysical region. However, the decay has not yet been measured. The BESIII experiment, located at the BEPCII collider in Beijing, China, has collected a data sample of 1010 J/ψ events.
In this talk, the current status of the search for the decay of J/ψ → p p e+ e− at the BESIII experiment is presented.
Supported by PRISMA+ Cluster of Excellence.