SMuK 2023 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
HK: Fachverband Physik der Hadronen und Kerne
HK 39: Hadron Structure and Spectroscopy IV
HK 39.3: Vortrag
Mittwoch, 22. März 2023, 16:30–16:45, SCH/A316
Search for exotic states in ηc decays at BESIII — •Anja Brüggemann1, Salleh Ahmed1, Nils Hüsken2, Nikolai in der Wiesche1, Hannah Neuwirth1, Ann-Christin Schluse1, Anna Theimann1, Frederik Weidner1, and Alfons Khoukaz1 for the BESIII collaboration — 1Westfälische Wilhelms-Universität 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 taken from 2009 to 2019.
Resulting from the radiative J/ψ decay into 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, η η and 2π+ 2π− 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 in h h intermediate states, that lie in the mass region below 2 GeV/c2, where the lightest glueball is predicted.
Incorporating all analysed ηc decay modes our study is based on a combined partial wave analysis approach, which gives access to the partial decay widths of contributing resonances decaying into the h h subsystems. These widths are directly comparable to theory predictions, that assume glueball admixtures carried by certain isoscalar scalar resonances. The current status of the analysis will be presented.
This work is funded by DFG - 269952272, 271236083 and 443159800.