Frankfurt 2014 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 38: Hadronenstruktur und -spektroskopie

HK 38.1: Group Report

Thursday, March 20, 2014, 14:00–14:30, HZ 3

selected charmonium and charmonium-like states at BESIII — •yu-ping guo for the BESIII collaboration — Institut für Kernphysik Johannes Gutenberg-Universität Mainz, Mainz, Germany

Using large data samples collected at ψ(3686) peak and around the peaks of the vector charmonium resonances above 4.0 GeV, study of the charmonium (charmonium-like) states are performed at BESIII experiment.

Comparing to the charmonium states above the charm threshold, the states below the charm threshold are well understood, except the three spin-singlet states, η_c, h_c and η_c(2S). With the data accumulated at the ψ(3686) peak, the properties of these states are measured with high precision or at the first time. Based on the data samples taken above 4.0 GeV, the process of π⁺ π⁻ h_c has been studied, the cross section line-shape will help us to understand the Y-states above the charm threshold. In addition, in the Dalitz study of the π⁺ π⁻ h_c system, a charged charmonium-like state Z_c(4020) has been observed, whose property is similar to the previous observed Z_c(3900) in π⁺ π⁻ J/ψ system.