SMuK 2023 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 29: Hadron Structure and Spectroscopy III
HK 29.5: Vortrag
Mittwoch, 22. März 2023, 15:15–15:30, SCH/A316
Investigation of the decays χcJ→η′π+π− and search for the spin exotic meson π1(1600) at BESIII — •Frederik Weidner, Salleh Ahmed, Anja Brüggemann, Nikolai in der Wiesche, Hannah Neuwirth, Ann-Christin Schluse, Anna Theimann, and Alfons Khoukaz for the BESIII collaboration — Westfälische Wilhelms-Universität, Münster, Germany
In recent years the search for exotic hadrons has produced more and more states which seem to be incompatible with the conventional classification as a two or three quark state. However, in most of these cases the classification of these particles is inconclusive. An interesting opportunity is given by states with quantum numbers which cannot be produced by the conventional quark model, such as JPC=1−+ in case of the π1(1600), which was seen in multiple experiments.
With the BESIII experiment decays of the χcJ mesons can be investigated through their production in radiative decays of the ψ(2S) meson. Here, a large number of events has been recorded by the BESIII detector and additional data taking is ongoing. When considering the decay of these charmonia into three pseudoscalar mesons, spin exotic quantum numbers like JPC=1−+ can be accessed. Additionally, precision measurements of branching ratios of the χcJ states can help solidify our understanding of the charmonium system. In this talk the current status of the search for the π1(1600) in the decay χc2→η′π+π− by the means of a partial wave analysis will be presented.
This work is funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) - 269952272, 271236083 and 443159800.