SMuK 2021 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 29: Hadron Structure and Spectroscopy VI

HK 29.3: Vortrag

Freitag, 3. September 2021, 14:45–15:00, H3

Investigation of the decays χ_cJ→η^′π⁺π⁻ and search for the spin exotic meson π₁(1600) at BESIII — •Frederik Weidner¹, Nienke Balz¹, Helge Balzen¹, Johannes Bloms¹, Anja Brüggemann¹, Christopher Fritzsch¹, Titus Heinig¹, Nils Hüsken², Sascha Lennartz¹, and Alfons Khoukaz¹ — ¹Westfälische Wilhelms-Universität, Münster, Germany — ²Indiana University, Bloomington, USA

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 J^PC=1⁻⁺ in case of the π₁(1600), which was seen in multiple experiments.
With the BESIII experiment decays of the χ_cJ mesons can be investigated through their production in the 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 J^PC=1⁻⁺ can be accessed. In this talk the current status of the search for the π₁(1600) in the decay χ_c2→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.