期刊
COMMUNICATIONS IN THEORETICAL PHYSICS
卷 73, 期 12, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1572-9494/ac27a2
关键词
hadronic molecules; heavy-heavy systems; Bethe-Salpeter equation; constant interaction; resonance saturation
资金
- Chinese Academy of Sciences (CAS) [XDPB15, XDB34030000, QYZDB-SSW-SYS013]
- National Natural Science Foundation of China (NSFC) [11835015, 12047503, 11961141012]
- NSFC
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [12070131001, 196253076-TRR110]
In this study, the spectrum of hadronic molecules composed of heavy-antiheavy charmed hadrons was examined, with experimental candidates such as X(3872) and Y(4260) fitting well. The success in describing heavy-antiheavy hadronic molecules led to predictions for heavy-heavy cases, highlighting the potential existence of DD* and D-(*)Sigma((*))(c) molecules. Recent experimental findings support the existence of heavy-heavy hadronic molecules, providing opportunities for further observation in upcoming LHCb and other experiments.
The spectrum of hadronic molecules composed of heavy-antiheavy charmed hadrons has been obtained in our previous work. The potentials are constants at the leading order, which are estimated from resonance saturation. The experimental candidates of hadronic molecules, say X(3872), Y(4260), three P-c states and P-cs (4459), fit the spectrum well. The success in describing the pattern of heavy-antiheavy hadronic molecules stimulates us to give more predictions for the heavy-heavy cases, which are less discussed in literature than the heavy-antiheavy ones. Given that the heavy-antiheavy hadronic molecules, several of which have strong experimental evidence, emerge from the dominant constant interaction from resonance saturation, we find that the existence of many heavy-heavy hadronic molecules is natural. Among these predicted heavy-heavy states we highlight the DD* molecule and the D-(*)Sigma((*))(c) molecules, which are the partners of the famous X(3872) and P-c states. Quite recently, LHCb collaboration reported a doubly charmed tetraquark state, T-cc , which is in line with our results for the DD* molecule. With the first experimental signal of this new kind of exotic states, the upcoming update of the LHCb experiment as well as other experiments will provide more chances of observing the heavy-heavy hadronic molecules.
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