TRR 110:  Symmetries and the Emergence of Structure in Quantum Chromodynamics (QCD)

• Subject Area: Physics
• Term: from 2012 to 2024
• Website: Homepage
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 196253076

The main theme of this CRC is the role of symmetries and the emergence of structure in Quantum Chromodynamics (QCD). Here, the complex structures that are investigated include hadrons as well as nuclei, as these are different manifestations of the strong force. It is the great strength of this CRC that the fields of hadronic and nuclear physics are considered together, as it is now accepted also world-wide. We have made quite some progress in all the various projects, with particular emphasis on the so-called exotic XYZ-states (and other exotic or unusual states) that have been at the center of many experimental and theoretical investigations all over the world in the past years. This CRC also combines in a unique fashion various techniques to tackle these difficult strongly interacting many-particle problems, namely effective field theories, lattice simulations and modeling. In particular, lattice simulations are now also applied to atomic nuclei and we intend to further strengthen this line of research, in strong synergy with the colleagues who investigate hadron structure and dynamics using such methods. In the second funding period, there was a continued focus on hadron physics aspects which was due to the existing collaborations with Chinese colleagues. In the second funding period we started collaborations in nuclear physics too, and accordingly in this period nuclear physics research increased. Consequently, hadron and nuclear physics will also be the main themes in the third period with an increased focus on projects requiring substantial computational resources. This reflects the increased contribution of high-performance computing in physics.

• DFG Programme: CRC/Transregios
• International Connection: China

Current projects

• A01 - Flavor symmetries and final-state interactions in hadronic decays (Project Heads Guo, Feng-Kun ;  Haidenbauer, Johann ;  Kubis, Bastian ;  Paul, Stephan ;  Zou, Bing-Song )
• A02 - Hadron dynamics on the lattice (Project Heads Liu, Chuan ;  Luu, Ph.D., Thomas ;  Urbach, Carsten )
• A03 - Effective field theory for threshold phenomena (Project Heads Brambilla, Nora ;  Hammer, Hans-Werner ;  Jia, Yu )
• A05 - Quark mass dependence of hadronic observables (Project Heads Guo, Feng-Kun ;  Meißner, Ulf-G. ;  Wang, Ping )
• A07 - Precision calculations in hadronic physics (Project Heads Dreiner, Ph.D., Herbert ;  Kubis, Bastian ;  Lü, Cai-Dian )
• A08 - Charmless exclusive B decays (Project Heads Beneke, Martin ;  Lü, Cai-Dian )
• A09 - EFT for electromagnetic currents: Foundations and applications (Project Heads Epelbaum, Evgeny ;  Kaiser, Norbert ;  Krebs, Hermann )
• A10 - Symmetry-violating hadronic interactions from lattice QCD (Project Heads Luu, Ph.D., Thomas ;  Petschlies, Marcus ;  Urbach, Carsten )
• A11 - Hadronic transition form factors from analyticity (Project Heads van Dyk, Danny ;  Kubis, Bastian )
• B01 - Partonic structure of nucleons and nuclei (Project Heads Dong, YuBing ;  Epelbaum, Evgeny ;  Hammer, Hans-Werner ;  Meißner, Ulf-G. ;  Polyakov, Ph.D., Maxim )
• B03 - Hadronic molecules with heavy meson loops (Project Heads Guo, Feng-Kun ;  Hanhart, Christoph ;  Wang, Qian ;  Zhao, Qiang )
• B04 - Boxed hadrons (Project Heads Liu, Chuan ;  Rusetsky, Akaki )
• B06 - Strangeness in nuclear systems (Project Heads Nogga, Andreas ;  Rusetsky, Akaki ;  Weise, Wolfram ;  Zhou, Shan-Gui )
• B07 - Chiral symmetry in nuclear physics (Project Heads Epelbaum, Evgeny ;  Kaiser, Norbert ;  Meißner, Ulf-G. ;  Meng, Jie ;  Nogga, Andreas )
• B08 - Quarkonium interactions in hadronic, nuclear and thermal matter (Project Heads Jia, Yu ;  Vairo, Antonio ;  Wang, Jian-Xiong )
• B09 - Lattice nuclear physics (Project Heads Epelbaum, Evgeny ;  Krebs, Hermann ;  Luu, Ph.D., Thomas ;  Meißner, Ulf-G. )
• B10 - Partial wave analysis (Project Heads Thoma, Ulrike ;  Wiedner, Ulrich )
• B11 - Coupled channel dynamics (Project Heads Rönchen, Deborah ;  Zou, Bing-Song )
• B12 - Parton distribution functions on the lattice (Project Heads Feng, Xu ;  Monti Steffens, Fernanda )
• Z01 - Central Tasks (Project Heads Meißner, Ulf-G. ;  Weise, Wolfram ;  Zou, Bing-Song )
• Z02 - Outreach (Project Heads Dreiner, Ph.D., Herbert ;  Hanhart, Christoph )

Completed projects

• A04 - Hadronic parity violation (Project Heads Kaiser, Norbert ;  Zhu, Shi-Lin )
• B05 - Exotic states from lattice QCD (Project Heads Chen, Ph.D., Ying ;  Urbach, Carsten )

• Applicant Institution: Rheinische Friedrich-Wilhelms-Universität Bonn
• Co-Applicant Institution: Chinese Academy of Science; Institute of High Energy Physics; Ruhr-Universität Bochum; Technische Universität München (TUM)
• Partner Organisation: National Natural Science Foundation of China
• Participating University: Peking University
• Participating Institution: Forschungszentrum Jülich; Chinese Academy of Sciences; Institute of Theoretical Physics; Chinese Academy of Science ; Theoretical Physics Center for Science Facilities
• Spokesperson: Professor Dr. Ulf-G. Meißner