北京谱仪III上通过粲奇异介子产生与衰变对部分奇特态的实验研究

BESIII实验以及B工厂实验上发现了很多与常规介子不同的所谓奇特态，比如Zc(3900)、Y(4260)、Ds0*(2317)、Ds1(2460)等，它们可能是分子态、多夸克态、混杂态等等，但目前的实验结果与相关理论研究尚不能给出明确的结论。本项目计划依托于北京正负电子对撞机BEPCII上的BESIII实验，利用3.8～4.6GeV能量区间的正负电子对撞数据，测量粲奇异介子对Ds(*)Ds(*)的产生截面谱，利用Ds(*)单标记技术寻找反冲信号Ds0*(2317)、Ds1(2460)，进而测量Ds0*(2317)、Ds1(2460)的衰变分支比等。这些实验研究结果将对该能区的粲偶素、类粲偶素奇特态、粲奇异介子奇特态的性质和结构有更深入的了解，促进量子色动力学在该能区的研究与发展。

Many states unlike conventional mesons, so called exotic states, were found at BESIII experiment and B-factories. For instance, Zc(3900)、Y(4260)、Ds0*(2317)、Ds1(2460) and so on, which could be molecular states, multi-quark states, hybrids and so on. The current results from experiments and the related theoretical investigation could not give certain conclusions. We propose a project based on the ee data between 3.8 and 4.6 GeV accumulated by BESIII experiment at BEPCII. The project includes the cross section spectra measurements of the processes ee to a charmed-strange-meson pair Ds(*)Ds(*), the observation of Ds0*(2317), Ds1(2460) by the singe Ds(*) tagging method, the measurements of Ds0*(2317), Ds1(2460) decays and so on. These experimental results would help better understanding the properties and nature of the charmonia, chamonium-like states and charmed-strange exotic states produced in this energy region. And they can also push the investigation and development of Quantum-Chromo-Dynamics at the low energy range.