Mainz 2022 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 63: Hadron Structure and Spectroscopy XI
HK 63.3: Vortrag
Donnerstag, 31. März 2022, 14:45–15:00, HK-H8
Search for the X17 boson at the BESIII experiment — •Saskia Plura, Achim Denig und Christoph Florian Redmer für die BESIII Kollaboration — 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, we developed a Monte Carlo generator to evaluate the possibility to search for the X17 boson in J/ψ → p p e+ e− decays, where the (anti-)proton emits an X17 which subsequently decays to an e+ e− pair. J/ψ decays provide a clean source of nucleon-antinucleon pairs at e+ e− colliders. We considered both possibilities of the X17 being either a pseudoscalar or an axial vector particle, as well as the QED background.
In this talk, we discuss the feasibility of searching for the X17 at the BESIII experiment, located at the BEPCII collider in Beijing, China, using the available data sample of 1010 J/ψ events.