Regular Article - Theoretical Physics
Hadronic molecules composed of a doubly charmed tetraquark state and a charmed meson
School of Physics, Beihang University, 100191, Beijing, China
2 School of Fundamental Physics and Mathematical Sciences, Hangzhou Institute for Advanced Study, UCAS, 310024, Hangzhou, China
3 University of Chinese Academy of Sciences, 100049, Beijing, China
4 School of Space and Environment, Beihang University, 100191, Beijing, China
5 Peng Huanwu Collaborative Center for Research and Education, Beihang University, 100191, Beijing, China
6 Beijing Key Laboratory of Advanced Nuclear Materials and Physics, Beihang University, 100191, Beijing, China
7 School of Physics and Microelectronics, Zhengzhou University, 450001, Zhengzhou, Henan, China
Accepted: 6 October 2022
Published online: 13 October 2022
The three pentaquark states, , and , discovered by the LHCb Collaboration in 2019, can be arranged into a complete heavy quark spin symmetry multiplet of hadronic molecules of . In the heavy quark mass limit, the baryons can be related to the doubly charmed tetraquark states of isospin 1, i.e., ( , , ), via heavy antiquark diquark symmetry, which dictates that the interactions are the same as the interactions up to heavy antiquark diquark symmetry breakings. In this work, we employ the contact-range effective field theory to systematically study the systems, and we show the existence of a complete heavy quark spin symmetry multiplet of hadronic molecules composed of a doubly charmed tetraquark state and a charmed meson. These are a new kind of hadronic molecules and, if discovered, can lead to a better understanding of the many exotic hadrons discovered so far. In addition, we summarise the triply charmed hexaquark states formed by different combinations of hadrons. In particular, we show that system can bind by the Coulomb force, which is analogous to a hydrogenlike atom.
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