I am a legal member of the BESIII Collaboration. BESIII is a symmetry e+e- collider experiment covering c.m energy 2 GeV to 4.6 GeV, and has accumulated world's largest charmonium/charmoniumlike data sample. I am studying conventional charmonium decays, and hunting new XYZ particles at BESIII. In 2013, I have discovered a charged charmoniumlike state Zc(3900), which might be the first four quark state with solid evidence. In addition, I also have a wide range study on X(3872), Y(4260)...
I am a legal member of the Belle Collaboration. Belle is an asymmetry e+e- collider experiment running @ Y(nS) (n=1,2,...,5). Belle has accumulated ~1000fb^-1 data, which is world's largest data sample. I am searching for extoic states from Initial-State-Radiation (ISR) process and two-photon production. I give the first measurement for gamma gamma to vector meson pairs cross section. Using Belle's full data set, I found a charged charmoniumlike state Z(3900) in Y(4260) decays.
(BESIII Collaboration) Zhiqing Liu et al., arXiv:1310.4101[contact author]
刘智青，沈成平，苑长征 《物理》2013, 42 (10): 6。 Zhiqing LIU, Chengping SHEN and Changzheng YUAN, Physics 2013, 42, (10): 6.