Bochum 2018 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 1: Hadron Structure and Spectroscopy I
HK 1.3: Talk
Monday, February 26, 2018, 14:45–15:00, HZO 50
Investigation of hc decay patterns at BESIII — •Meike Kuessner — Ruhr-Universität Bochum, Institut für Experimentalphysik I, 44780 Bochum
The BESIII experiment at the BEPCII electron-positron collider in Beijing offers excellent opportunities to study rare charmonium decays, due to the high statistics data samples which were recorded at center of mass energies between √s=2−4.6 GeV.
Although the existence of the pseudovector charmonium state hc (JPC=1+−) has already been confirmed experimentally in 1992, the decay pattern remained almost unknown. Only half of the expected decay channels, regarding the total resonance width, have been observed.
The hc state goes hand in hand with a special experimental challenge due to the circumstance that it can not be produced directly in e+e− annihilation or via radiative transitions from vector charmonium states.
In the analysis presented here, the hc state is studied in the production processes ψ(2S)→ π0 hc and Y→ π+ π− hc (where Y denotes the ψ(4160), Y(4230), Y(4260), or ψ(4415) state).
Preliminary results of the search for unknown hc decay modes will be presented, based on 448 · 106 ψ(2S) events and data sets recorded at √s= 4.180, 4.230, 4.260, and 4.420 GeV corresponding to 6180 pb−1. Besides a discussion of the performed data selection, preliminary results for measured branching fractions of the hc state will be presented.
Supported by DFG (FOR 2359)