Erlangen 2026 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 12: Hadron Structure and Spectroscopy IV
HK 12.2: Gruppenbericht
Dienstag, 17. März 2026, 16:45–17:15, PHIL A 401
Search for the Lightest Glueball via the Reactions ψ(2S) → φ + ππ,4π,KK,ηη and ηη′ at BESIII — •Nikolai in der Wiesche, Frederik Weidner, Anja Brüggemann, Lois Kröger, Tessa Bertelsmeier, Jans Böing, Hannah Neuwirth, and Alfons Khoukaz for the BESIII collaboration — Universität Münster, Germany
The self-interaction of gluons is one of the most fundamental features of QCD, which implies the existence of purely gluonic bound states, called glueballs. However, to this day, no unambiguous experimental evidence of such state has been found. Theoretical calculations predict the mass of the lightest glueball, with quantum numbers JPC = 0++, to be between 1.6 GeV and 1.7 GeV. Therefore, the three experimentally observed isoscalar 0++ states f0(1370), f0(1500) and f0(1710), are promising candidates to contain admixtures of this glueball. Due to many contradictory measurements of their properties, the assignment of these states is still controversial.
In this talk, the current progress of a large-scale coupled-channel analysis project investigating the reactions ψ(2S)→φ+ππ,4π,KK,ηη and ηη′ will be presented. Using the world’s largest ψ(2S) data set obtained at BESIII, this project aims at extracting the properties of the f0 states, which are produced as intermediate resonances in the recoil systems of the φ meson.
This work is supported by the DFG under the project number 547123630 and by the Ministry for Culture and Science of the State North Rhine-Westphalia under funding code NW21-024-E.
Keywords: partial wave analysis (PWA); glueball; light meson spectroscopy; scalar isoscalar resonances