Erlangen 2026 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 27: Poster Session
HK 27.11: Poster
Mittwoch, 18. März 2026, 16:15–18:30, Redoutensaal
Investigation of the decay χc2→ K+K−η′ and search for the exotic K1* at the BESIII Experiment — •Anna Tsias, Achim Denig, and Nils Huesken — Johannes Gutenberg-Universität Mainz
The BESIII experiment provides an opportunity to investigate χcJ decays occurring in radiative Ψ(2S) transitions, thanks to its large data sample of (2259.3 ± 11.1) × 106 ψ(2S) events. Motivated by evidence for exotic mesons like the π1(1600), this analysis investigates χc2 decays to search for exotic resonances in the strange sector. In the Kη′ subsystem, there is the possibility to observe the hypothesized K1*, a strange member of the exotic hybrid nonet with quantum numbers JPC = 1−+. This is motivated by the observation of analogous states such as the π1(1600) and η1(1855) in similar charmonium decays. This decay channel is further of interest because it enables the study of higher-mass f2 and f4 mesons in the K+K− subsystem, several of which were last reported in the 1990s and have not been revisited with modern datasets. Additionally, the f2 resonances observed in the K+ K− system are possible tensor glueball candidates, making this analysis a potential starting point for their identification.
Keywords: hadron spectroscopy; exotic hadron; BESIII