Search for exotics in baryon-antibaryon states

在这里建议的研究项目范围内，通过BESIII实验收集的现有和未来数据将用于系统调查寻找奇异粒子并研究其性质。对于拟议的工作，存在来自e+e碰撞的大量数据集，这些数据集将在BEPCII存储环上扩大，我们的工作组直接参与。我们感兴趣的中心是3.70GeV到4.60GeV之间的高质量中心能量数据，它最近被用来提取关于奇异粒子候选Y(4260)和Y(4360)的有价值的信息。这里提出的研究项目的主要目标是研究质子-反质子对在最终状态下的反应。更详细地，将研究终态通道p pbar、p pbarγ、p pbarω、p pbarη、p pbarΦ和p pbarππ。在这里，既可以直接检测这些反应，也可以在初始态辐射过程中检测这些反应。通过BESIII实验收集的数据将允许在引用的能量区域搜索可能的共振。此外，在ppbar子系统中寻找共振对于未来的熊猫实验来说是非常有意义的，在该实验中，质子-反质子碰撞将被用来直接搜索查莫尼区的奇异粒子。作为熊猫合作的一员，将促进两个合作之间的密切合作。此外，将在反应e+e-→X(3915)ππ中研究可能的奇异状态X(3915)的产生，其中X(3915)衰变到显著可见的J/ψω通道。利用分波分析，可以潜在地解决目前模糊的X(3915)态的自旋宇称分配为J(PC)=0(++)或J(PC)=2(++)。

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.