Search for new hadrons and study of hadron spectroscopy at BESIII and PANDA

该项目旨在使来自中国北京高能物理研究所（IHEP）和德国波鸿鲁尔大学（RUB）的两个研究小组在强子物理领域开展合作。BESIII实验是目前强子物理领域最成功的实验之一。它的结果，比如对全新的、完全出乎意料的粒子的仔细研究，为更深入地理解强相互作用铺平了道路。未来几年，随着能量和亮度的进一步升级，可以理所当然地期待在结果方面取得极其丰硕的成果。这是FG2359的延续，将于2021年结束，利用新的可实现数据集的新项目范围。同时，并不是所有新结果或强相互作用的非摄动部分所提出的问题都能得到决定性的回答。这就是德国FAIR设施的新PANDA实验将在几年后开始的地方。PANDA将研究反质子-质子湮灭过程，并将其与BESIII的电子-正电子湮灭过程进行比较。波鸿集团只从BMBF获得了用于PANDA硬件建设的资金，而没有用于物理准备。由于每种颗粒的生产工艺都有其各自的优点和缺点，因此它们的组合是一种理想的情况。我们计划在未来几年利用BESIII的数据集来研究所谓的QCD外来物，这些外来物是由于强相互作用的特定独特特征而存在的。备受尊敬的IHEP小组和中国大学的参与，以及RUB的国际合作伙伴，将是成功的关键。IHEP小组直接参与实验，确保了合作伙伴之间持续的第一手结果和信息流动，从而实现了最有效的数据采集计划和快速的高质量分析。RUB小组在过去30年的不同实验中在强子物理方面的长期专业知识很好地补充了这一点。现有的分析包，如RUB的部分波分析包PAWIAN，将用于分析一般数据，并将进一步开发以供PANDA将来使用。在BESIII开发和测试的技术，如在量热计中有效地重建电磁粒子的能量，将在PANDA转移和利用。RUB集团是PANDA电磁量热计硬件建设的关键团队之一，IHEP集团是PANDA- emc离线软件和读出开发的强有力合作伙伴，再次形成了必要的富有成效的协同效应。两位项目负责人，沈晓燕教授和乌尔里希·维德纳教授在强子物理方面有着长期的领先实验记录，项目的两位关键参与者已经作为BESIII轻强子组的召集人成功地合作过。

This project is tailored to enable two groups, one from Institute of High Energy Physics (IHEP) in Beijing (China) and the other from the Ruhr-University Bochum (RUB, Germany) to work together in the field of hadron physics. The BESIII experiment is currently one of the most successful experiments in the field of hadron physics. Its results like the careful investigation of newly, completely unexpected particles pave the way for a much deeper understanding of the strong interaction.The coming years with an additional upgrade of energy and luminosity can rightfully be expected to be extremely fruitful in terms of results. This is a continuation of the FG2359 which ends in 2021 with a new scope of the program taking advantage of the newly achievable data sets. At the same time, not all questions posed by new results or the non-perturbative part of the strong interaction can be answered conclusively. This is the point where the new PANDA experiment at the FAIR facility in Germany will pick up in a few years from now. PANDA will study the antiproton-proton annihilation process compared to the electron-positron annihilation at BESIII. The Bochum group received only funding from BMBF for the construction of hardware for PANDA but not for the preparation of physics. Since each of the production processes of particles have their individual advantages and disadvantages, their combination is an ideal case. We plan in the next years to take data sets at BESIII to study so-called QCD exotics which are present due to the specific unique features of the strong interaction. The presence of the highly respected IHEP group and Chinese universities together with the international partner at RUB will be a key in making this a success. The presence of the IHEP group directly at the experiment assures a continuous first-hand flow of results and information among the partners, allowing for a most effective data-taking plan and speedy high-quality analysis. The long-standing expertise of the RUB group in hadron physics in different experiments over the past 30 years complements this nicely. Existing analysis packages like the partial-wave analysis package PAWIAN at RUB will be used to analyze commonly the data and being further developed for a future use at PANDA. Techniques, like an efficient energy reconstruction of electromagnetic particles in a calorimeter, developed and tested at BESIII will be transferred and utilized at PANDA. The RUB group is one of the key groups for the hardware construction of the PANDA electromagnetic calorimeter and the IHEP group is a strong partner in the development of offline software and the readout of the PANDA-EMC, again creating necessary fruitful synergies. The PIs, Prof. Xiaoyan Shen and Prof. Ulrich Wiedner have a long-standing track record from several leading experiments in hadron physics and two key participants in the project had already worked successfully together as conveners of the light hadron group in BESIII.