Köln 2025 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 29: Hadron Structure and Spectroscopy III
HK 29.4: Vortrag
Mittwoch, 12. März 2025, 16:45–17:00, HS 3 Physik
Search for conventional charmonia and light exotic candidates in the decay ψ(2S)→γη′π+π− at BESIII — •Frederik Weidner, Tessa Bertelsmeier, Jans Böing, Anja Brüggemann, Lotta Frese, Nikolai in der Wiesche, Lois Kröger, Hannah Neuwirth, and Alfons Khoukaz for the BESIII Germany collaboration — Universität Münster, Münster, Germany
In recent years, the search for exotic hadrons has uncovered an increasing number of states that seem to be incompatible with the conventional classification as two or three quark states. Examples for these are the π1(1600) or the X(1835).
One way to study these states is the analysis of the ψ(2S) data sample of the BESIII experiment, which also allows the precise determination of the branching ratios of lower lying charmonium states such as ηc and χcJ. Considering the decay of the χc1,2 charmonia into three pseudoscalar mesons, the spin-exotic quantum numbers JPC=1−+ can be accessed. In addition, precision measurements of the branching ratios of the χcJ states can help to solidify our understanding of charmonia and can be used as input to models such as NRQCD.
In this talk, the search for the π1(1600) in the decay χc2→η′π+π− using a partial wave analysis, the determination of branching ratios of χcJ,ηc→η′π+π− and the search for additional states in the η′π+π− system, are presented. This work is supported by the German Research Foundation under project number 443159800 and GRK 2149/2 and by the Ministry for Culture and Science of the State North Rhine-Westphalia under funding code NW21-024-E.
Keywords: Charmonium; Hybrid; Light meson; Exotic state; Partial wave analysis