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Progress towards a precise ab initio determination of parton structure of hadrons

Subject Area Nuclear and Elementary Particle Physics, Quantum Mechanics, Relativity, Fields
Term from 2021 to 2025
Project identifier Deutsche Forschungsgemeinschaft (DFG) - Project number 448374536
 
Final Report Year 2024

Final Report Abstract

This was a project in the initiative “Joint Sino-German Research Project 2020”which was based on the collaboration between Chinese physicist living in the US, Chinese physicists living in the Peoples Republic or Taiwan, and my group. The topic was the development and application of a new method, called LaMET, to perform Lattice QCD (LQCD) calculations which allow to obtain far more information than previous methods (at least in principle). The driving force behind this development is Xiangdong Ji who was simultaneously professor at Maryland University, USA and Jiao Tong University, Shanghai. The so called LPC collaboration lead by him comprises about 25 physicists from several countries. Meanwhile Xiangdong Ji has given up his Chinese affiliations and the chair-person of LPC became Yi-Bo Yang, Beijing. This was one of many consequence of the very much worthened relations between the US and the Peoples Republic. In parallel also the German-Chinese relationship became stressed. The DFG organized two online workshops, 2.12.2022 and 1.6.2023, to inform about the novel, really complicated situation for academic collaboration with the Peoples Republic. For our project all these problems were increased by the fact that normally we use computer time at German and European High Performance Computer Centers but I decided not to provide any access for Chinese LPC members to them because of security issues. At the same time, some of my students were involved in this collaborations and I did not want to delay progress of their studies. Finally, several very good young Chinese collaborators found positions in the US or Europe. The combination of all these problems and aspects was quite demanding, but I think that we found good solutions to make this DFG project a success in spite of all of them. I hired Dr. Hai-Tao Shu using the postdoc position I got for this project. Dr. Shu was a postdoc at Bielefeld University working on LQCD before coming to Regensburg and thus was already part of the German academic system. He has moved last year to Brookhaven National Laboratory, USA. In addition I split my LaMET sub-projects into computationally non-intensive (group 1) and intensive (group 2) ones. The former could be performed on the Regensburg university computer “Athene” or Chinese computer systems. (As stated already, Chinese collaborators were only involved in numerical work for this group of sub-projects.) For group one sub-projects we also generated two rather coarse lattice ensembles (CLS ensembles X650 and X651), which fit on Athene, with especially large spatial extent to be able to average over all transverse directions of gauge links. This final report focuses on the first group of sub-projects.

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