Hamburg 2016 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 34: Starke Wechselwirkung (Experiment) II
T 34.4: Vortrag
Montag, 29. Februar 2016, 17:30–17:45, VMP8 SR 206
Precision studies of three pion final states of J/Ψ and Ψ′ at BESIII — •Stuart Fegan — Johannes Gutenberg Universität, Mainz
The BESIII experiment at the Institute of High Energy Physics, Chinese Academy of Sciences, in Beijing, has been operating since 2008 with the aim of accumulating large data samples from e+e− collisions for detailed studies in the fields of charm physics and hadron spectroscopy. These data include large samples of J/Ψ and Ψ′ decays collected during run periods in 2009 and 2012.
The three pion final states (π+ π− π0) of J/Ψ and Ψ′ production were previously studied using the 2009 BESIII data, confirming the unexpectedly low branching fraction of the Ψ′ and revealing markedly different di-pion mass spectra and Dalitz ditributions in comparison to the J/Ψ. These differences have yet to be fully explained, and form the basis of the so-called ‘ρπ puzzle’.
The work presented will focus on efforts to realise more precise studies of these states in BESIII by including the larger 2012 data set in the analysis, and the application of robust partial wave analysis (PWA) techniques being developed in Mainz.