Erlangen 2026 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 12: Hadron Structure and Spectroscopy IV
HK 12.7: Vortrag
Dienstag, 17. März 2026, 18:15–18:30, PHIL A 401
Coupled-Channel Partial-Wave Analysis of the Decays ψ(2S)→ω+ KK,ππ, ηη, ηη′,4π — •Lois Kröger, Tessa Bertelsmeier, Jans Böing, Anja Brüggemann, Nikolai in der Wiesche, Hannah Neuwirth, Frederik Weidner, and Alfons Khoukaz for the BESIII collaboration — University of Münster
The BESIII experiment provides a datasample of 2.7 billion events of the vector charmonium ψ(2S) produced in electron-positron collisions. This high-statistics data sample is utilised to perform a coupled-channel partial-wave analysis of the decays ψ(2S)→ω + KK, ππ, ηη′, ηη, 4π. The resonance parameters and the partial widths of the isoscalar, scalar resonances f0(1370), f0(1500) and f0(1710) produced as intermediate states in the analysed decay chains are studied. As these resonances lie in the same mass range as the lightest predicted glueball and also share the same quantum numbers, they are candidates to have an admixture of this predicted purely gluonic state. Therefore, this analysis aims to gain insight on the composition of the f0 states below 2 GeV via the extracted resonance information in search for the lightest glueball. As a fundamental prediction of QCD, experimental evidence for the lightest glueball would greatly contribute to the understanding of the strong interaction. First results of the analysis will be presented in this talk. This work is supported by the DFG under the project number 547123630.
Keywords: Glueball; Charmonium; Light Mesons; Partial Wave Analysis; BESIII