Recently, the BESIII collaboration reported a new resonance, which is named as Zc(3900)±. In the charm region, the particle is composed of a quark and an anti-quark, which is regarded as charmonium. In general, charmonium is neutral.
However, the new observed charged particle Zc(3900)± should have at least four quarks due to its mass and charge. This state may be one of the exotic states which have been long-time looked for. The observation of these exotic states is crucial for the understanding of the structure of hadron and QCD.
The production of the newly observed charged charmoniumlike state Zc(3900)± was explored by researchers in Institute of Modern Physics, Chinese Academy of Sciences (IMP) via the photoproduction process 
.
The numerical result indicated that the maximum of the calculated total cross section of 
could reach up to the order of 0.1µb.
Furthermore, the Dalitz plot analysis was performed by considering the Pomeron exchange as the background contribution. This analysis showed that the Zc(3900)± signal could be distinguished from the background easily and the best energy window of searching for Zc(3900)± is 
, which is important information for further experimental study of Zc(3900)± by meson photoproduction.
The work has been published in Phys. Rev.D. 88, 114009 (2013).
Fig.1 The total cross section for 
. (Image by IMP)
Fig.2 The Dalitz plot and the invariant mass spectrum of 
. (Image by IMP)
Introduction
