Münster 2017 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 1: Hadron Structure and Spectroscopy I

HK 1.7: Vortrag

Montag, 27. März 2017, 18:45–19:00, F 5

Partial wave analysis of three pion final states of J/Ψ and Ψ' at BESIII — •Stuart Fegan for the BESIII collaboration — Johannes Gutenberg University, Mainz

The BESIII experiment at the Institute of High Energy Physics, Chinese Academy of Sciences, 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.

Three pion final states (π+π-π0) of J/Ψ and Ψ' decays have been previously studied at several facilities. Despite the same final state, the Ψ' decay shows an unexpectedly low branching fraction and markedly different di-pion mass spectra and Dalitz distributions. One route to explaining these differences, which form the basis of the so-called `ρπ puzzle', is to perform partial wave analysis (PWA) of both the J/Ψ and Ψ' decays, testing possible explanations through the intermediate meson states they predict.

The work presented will highlight the progress towards realising PWA of these channels on the BESIII data, and the tools and techniques being developed in Mainz for this purpose.