Search for exotics in baryon-antibaryon states

在重子-反重子状态中寻找外来物种

• 批准号: 408025892
• 负责人: Professor Dr. Alfons Khoukaz
• 金额: --
• 依托单位: Institut für Kernphysik
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/408025892?language=en
• 关键词: Search; exotics; baryon; antibaryon; states

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.

在这里建议的研究项目范围内，利用BESIII实验收集到的现有和未来的数据应使用进行系统的研究，以寻找奇异粒子并研究它们的性质。对于提议的工作，来自e+e碰撞的大量数据集已经存在，我们的工作组将在BEPCII存储环的直接参与下扩大这些数据集。我们感兴趣的中心是3.70 GeV和4.60 GeV之间的高质能中心数据，这些数据最近被用来提取有关奇异候选粒子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的是研究质子-反质子对在最终状态下的反应。更详细地研究了ppbar、ppbar γ、ppbar ω、ppbar η、ppbar Φ和ppbar ππ的终态通道。在这里，可以直接检测这些反应，也可以在初始状态辐射过程中检测这些反应。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p - pbar子系统中寻找共振对于未来的PANDA实验具有很高的兴趣，在PANDA实验中，质子-反质子碰撞将用于直接搜索粲子区中的外来粒子。作为PANDA合作的成员，将促进双方的密切合作。此外，在e+e-→X(3915)ππ反应中可能产生的奇异态X（3915）应该被研究，其中X（3915）衰变成明显可见的J/ψω通道。利用部分波分析，可以解决当前模棱两可的X（3915）态的自旋宇称赋值为J(PC) = 0（++）或J(PC) = 2（++）的问题。