Research On (like) Charcoal On BESⅢ

Several conventional charmonium states above the mass threshold of open-charm pair,including ψ(3770),ψ(4040),ψ(4160)and ψ(4415),have been established in the past,while numerous unexpected charmonium-like states or structures in this region were observed in the recent 17 years.For instance,many neutral-charged resonance structures such as X(3872),Y(4260),Y(4360)and Y(4660)were discovered in BELLE and BABAR exeriments,while the charged Zc±(3900)and Zc±(4020)were observed at BESⅢ experiment.These exciting findings provide new opportunities and challenges to us to study strong interactionsThe cross section of e+e-annihilation into exclusive open-charm channels can help to investigate not only the conventional vector charmonia but also the vector charmonium-like XYZ states.This thesis describes a measurement of the Born cross section for the e+e-→Ds*+Ds*-process at energies from the production threshold to 4.6 GeV with the data taken at BESⅢ.In the process of cross section measurement,we adopted a new iterative method for the first time to deal with the initial state radiation correction problem,which greatly reduced the time cost to deal with such problem and formed a generalization example.