SMuK 2021 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 19: Hadron Structure and Spectroscopy IV
HK 19.4: Vortrag
Mittwoch, 1. September 2021, 17:30–17:45, H3
Search for the X17 boson at the BESIII experiment — •Saskia Plura, Achim Denig, and Christoph 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 particle is referred to as the X17 boson, which 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 radiates off an X17. 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 BESIII, located at the BEPC-II collider in Beijing, China, using a collected data sample of 1010 J/ψ events. - Supported by DFG.