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HK: Fachverband Physik der Hadronen und Kerne
HK 31: Hadron Structure and Spectroscopy V
HK 31.3: Vortrag
Dienstag, 29. März 2022, 16:45–17:00, HK-H8
Search for exotic states in ηc decays at BESIII — •Anja Brüggemann1, Nienke Balz1, Helge Balzen1, Johannes Bloms1, Christopher Fritzsch1, Titus Heinig1, Nils Hüsken2, Nikolai in der Wiesche1, Lois Kröger1, Sascha Lennartz1, Peter Sandmann1, 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.
Resulting from the radiative J/ψ decay to γ ηc we analyse the reactions ηc → η′ h h, where the h h system represents the K+ K−, KS KS, π+ π−, π0 π0 and η η systems. Since the majority of these ηc decay modes are still unlisted in the particle data group database we determine the corresponding branching ratios. Furthermore, since these mesonic ηc decays constitute a gluon-rich environment they offer the opportunity to investigate possible exotic content within h h intermediate states, that lie in the mass region below 2 GeV/c2, where the lightest glueball is predicted.
Incorporating the analysed ηc decay modes our study is based on a combined partial wave analysis, which gives access to the partial decay widths of contributing resonances decaying to h h. 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.