Full-Heavy Tetraquarks in Constituent Quark Models
Eur. Phys. J. C (2020) 80:1083 https://doi.org/10.1140/epjc/s10052-020-08650-z Regular Article - Theoretical Physics Full-heavy tetraquarks in constituent quark models Xin Jina, Yaoyao Xueb, Hongxia Huangc, Jialun Pingd Department of Physics and Jiangsu Key Laboratory for Numerical Simulation of Large Scale Complex Systems, Nanjing Normal University, Nanjing 210023, People’s Republic of China Received: 4 July 2020 / Accepted: 10 November 2020 / Published online: 23 November 2020 © The Author(s) 2020 Abstract The full-heavy tetraquarks bbb¯b¯ and ccc¯c¯ are [5]. Since then, more and more exotic states were observed systematically investigated within the chiral quark model and proposed, such as Y (4260), Zc(3900), X(5568), and so and the quark delocalization color screening model. Two on. The study of exotic states can help us to understand the structures, meson–meson and diquark–antidiquark, are con- hadron structures and the hadron–hadron interactions better. sidered. For the full-beauty bbb¯b¯ systems, there is no any The full-heavy tetraquark states (QQQ¯ Q¯ , Q = c, b) bound state or resonance state in two structures in the chiral attracted extensive attention for the last few years, since such quark model, while the wide resonances with masses around states with very large energy can be accessed experimentally 19.1 − 19.4 GeV and the quantum numbers J P = 0+,1+, and easily distinguished from other states. In the experiments, and 2+ are possible in the quark delocalization color screen- the CMS collaboration measured pair production of ϒ(1S) ing model. For the full-charm ccc¯c¯ systems, the results are [6].
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