Search for exotics in baryon-antibaryon states

在这里建议的研究项目范围内，将利用BESIII实验收集的现有和未来数据进行系统调查，以寻找奇异粒子并研究其性质。对于拟议的工作，广泛的数据集产生的e+e-碰撞存在，这将扩大在BEPCII储存环与我们的工作组的直接参与。我们感兴趣的中心是3.70 GeV和4.60 GeV之间的高质心能量数据，这些数据最近被用来提取关于奇异粒子候选者Y（4260）和Y（4360）的有价值的信息。这里建议的研究项目的主要目标是研究最终状态下质子-反质子对的反应。更详细地，将研究末态通道p pbar、p pbar γ、p pbar ω、p pbar η、p pbar Φ和p pbar ππ。在这里，可以直接检测这些反应，以及在初始状态的辐射过程。BESIII实验收集的数据将允许在所引用的能量区域中搜索可能的共振。此外，在p pbar子系统的共振搜索是高度关注的未来PANDA实验，其中质子-反质子碰撞将用于直接搜索奇异粒子的粲偶素部门。作为PANDA协作的成员，将促进两个协作之间的密切合作。此外，在反应e+e- → X（3915）ππ中研究可能的奇异态X（3915）的产生，X（3915）衰变到显著可见的J/π ω通道。使用分波分析，目前X（3915）态的模糊自旋宇称分配为J（PC）= 0（++）或J（PC）= 2（++）可能被解决。

In the scope of the research project suggested here, available and future data gathered with the BESIII experiment shall be used for a systematic investigation in the search for exotic particles and the study of their properties. For the proposed work, extensive datasets stemming from e+e- collisions exist, which will be enlarged at the BEPCII storage ring with direct participation of our working group. At the center of our interest are the high center of mass energy data between 3.70 GeV and 4.60 GeV, which had recently been used to extract valuable information regarding the exotic particle candidates Y(4260) and Y(4360). The main objective of the research project suggested here is the investigation of reactions with a proton-antiproton pair in the final state. In more detail, the final state channels p pbar, p pbar γ, p pbar ω, p pbar η, p pbar Φ, and p pbar ππ shall be studied. Here, it is possible to detect these reactions both directly as well as in initial state radiation processes. Data collected with the BESIII experiment will allow to search for possible resonances in the quoted energy region. In addition, the search for resonances in the p pbar subsystem is of high interest with regard to the future PANDA experiment, in which proton-antiproton collisions will be used for direct searches of exotic particles in the charmonium sector. As a member of the PANDA collaboration, a close cooperation between both collaborations will be facilitated. Additionally, the production of the possibly exotic state X(3915) shall be studied in the reaction e+e- → X(3915)ππ, with the X(3915) decaying into the prominently seen J/ψω channel. Using a partial wave analysis, the currently ambiguous spin-parity assignment of the X(3915) state as either J(PC) = 0(++) or J(PC) = 2(++) can potentially be resolved.