SMuK 2021 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 29: Hadron Structure and Spectroscopy VI

HK 29.4: Vortrag

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

Determination of the branching ratio of η_c → η^′ K⁺ K⁻ and search for exotic content in K⁺ K⁻ intermediate states at BESIII — •Anja Brüggemann¹, Nienke Balz¹, Helge Balzen¹, Johannes Bloms¹, Christopher Fritzsch¹, Titus Heinig¹, Nils Hüsken², Sascha Lennartz¹, Frederik Weidner¹, and Alfons Khoukaz¹ for the BESIII collaboration — ¹Westfälische Wilhelms-Universität Münster, Germany — ²Indiana University Bloomington, USA

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 10 billion events taken from 2009 to 2019.

We analyse the reaction η_c → η′ K⁺ K⁻ that results from the radiative J/ψ decay to γ η_c. Until now this η_c decay is still unlisted in the particle data group database. We determine the corresponding branching ratio. Furthermore, it is a common approach to search for exotic states in gluon-rich environments of decaying mesons, like the decaying η_c charmonium into hadrons. Thus, our analysis of η_c → η′ K⁺ K⁻ further offers the opportunity to investigate possible exotic content within intermediate states decaying to K⁺ K⁻, 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, which gives access to the partial decay widths of contributing K⁺ K⁻ resonances. These widths are directly comparable to theory predictions.

The current status of the analysis will be presented.

This work is funded by DFG - 269952272, 271236083 and 443159800.