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HK: Fachverband Physik der Hadronen und Kerne
HK 24: Hadron Structure and Spectroscopy III
HK 24.2: Talk
Tuesday, March 12, 2024, 16:15–16:30, HBR 62: EG 19
Search for exotic states in the ηc decay to η′ K+ K− at BESIII — •Anja Brüggemann1, Salleh Ahmed1, Nils Hüsken2, Nikolai in der Wiesche1, Frederik Weidner1, and Alfons Khoukaz1 for the BESIII collaboration — 1Universität Münster, Germany — 2Johannes Gutenberg-Universität Mainz, Germany
The BESIII detector at the e+ e− collider BEPCII in Beijing, China, provides the world’s largest data sample of the charmonium J/ψ with more than 10 billion events collected from 2009 to 2019.
Starting from the radiative J/ψ decay into γ ηc, we analyse the reaction ηc → η′ K+ K− to determine the corresponding branching ratio as well as the mass and width of the ground-state charmonium ηc based on a signal yield much higher than achieved in former analyses. Moreover, this mesonic ηc decay provides the opportunity to investigate possible exotic content in K+ K− intermediate states, that lie in the mass region below 2 GeV/c2, where the lightest glueball is predicted.
Our study is based on a partial wave analysis approach that gives access to the properties of the ηc charmonium and to the partial decay widths of contributing resonances decaying into the K+K− subsystem. These widths are directly comparable to theoretical predictions, which assume glueball admixtures carried by certain considered resonances.
The current status of the analysis is presented.
This work is supported by the German Research Foundation (DFG) under the project number 443159800 and the DFG Research Training Group 2149/2.
Keywords: Glueball; Charmonium; Light Meson; Partial Wave Analysis