Regular Article - Theoretical Physics
Is X(7200) the heavy anti-quark diquark symmetry partner of X(3872)?
School of Space and Environment, Beihang University, 100191, Beijing, China
2 School of Physics, Beihang University, 100191, Beijing, China
3 Beijing Key Laboratory of Advanced Nuclear Materials and Physics, Beihang University, 100191, Beijing, China
4 Beijing Advanced Innovation Center for Big Data-Based Precision Medicine, School of Medicine and Engineering, Beihang University, 100191, Beijing, China
5 School of Physics and Microelectronics, Zhengzhou University, 450001, Zhengzhou, Henan, China
Accepted: 13 February 2021
Published online: 22 February 2021
The system and system can be related to the system via heavy anti-quark di-quark symmetry (HADS). In this work, we employ a contact-range effective field theory to systematically investigate the likely existence of molecules in these systems in terms of the hypothesis that X(3872) is a bound state in the isospin symmetry limit, with some of the unknown low energy constants estimated using the light-meson saturation approximation. In the meson–meson system, a molecule commonly referred to as X(4013) is reproduced, which is the heavy quark spin partner of X(3872). In the meson-baryon system, we predict two triply charmed pentaquark molecules, and . In the baryon-baryon system, there exist seven di-baryon molecules, , , , , , , and . Among them, the molecule may contribute to the X(7200) state recently observed by the LHCb Collaboration, which implies that X(7200) can be related to X(3872) via HADS. As a byproduct, with the heavy quark flavor symmetry we also study likely existence of molecular states in the , , and systems.
© The Author(s) 2021
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