Darmstadt 2016 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 23: Hadron Structure and Spectroscopy IV
HK 23.1: Group Report
Tuesday, March 15, 2016, 16:30–17:00, S1/01 A5
Light Meson Spectroscopy in Electron-Positron and Antiproton-Proton Annihilations — •Malte Albrecht, Bertram Kopf, Marc Pelizäus, Julian Pychy, Fritz-Herbert Heinsius, and Ulrich Wiedner — Inst. f. Experimentalphysik I, Ruhr-Universität Bochum
QCD predicts exotic bound states, such as states with gluonic degrees of freedom like glueballs or hybrids in the mass region between 1 and 2 GeV/c2. Especially radiative decays of charmonia and the antiproton-proton annihilation process provide an excellent laboratory to study the light meson sector, since both are referred to as ’gluon-rich’ processes.
Due to the presence of many broad and often overlapping states in the light meson sector, the properties of the contributing resonances can mostly only be accessed via a full partial wave analysis.
Recent results from analyses of radiative charmonium decays using data from the BESIII experiment at the symmetric electron-positron collider BEPCII in Beijing, as well as the Crystal Barrel/LEAR experiment are presented. Parts of the analyses from both annihilation processes are performed utilizing the user-friendly partial wave analysis software PAWIAN, which is being developed in Bochum.
Apart from a deeper understanding of the light meson spectrum and the existence of possible exotic states, the analyses are an important step towards the analysis of data from the upcoming PANDA experiment at FAIR.
Supported by the DFG