A survey of heavy–heavy hadronic molecules  

作　　者：Xiang-Kun Dong Feng-Kun Guo Bing-Song Zou 

机构地区：[1]CAS Key Laboratory of Theoretical Physics,Institute of Theoretical Physics,Chinese Academy of Sciences,Beijing 100190,China [2]School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China [3]School of Physics,Central South University,Changsha 410083,China

出　　处：《Communications in Theoretical Physics》2021年第12期86-104,共19页理论物理通讯（英文版）

基　　金：supported in part by the Chinese Academy of Sciences(CAS)under Grant No.XDPB15,No.XDB34030000,No.QYZDB-SSWSYS013;by the National Natural Science Foundation of China(NSFC)under Grant No.11835015,No.12047503,No.11961141012;by the NSFC and the Deutsche Forschungsgemeinschaft(DFG,German Research Foundation)through funds provided to the Sino-German Collaborative Research Center‘Symmetries and the Emergence of Structure in QCD’(NSFC Grant No.12070131001,DFG Project-ID 196253076—TRR110)。

摘　　要：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^(*)∑_(c)^(*)molecules,which are the partners of the famous X(3872)and Pc 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.

关 键 词：hadronic molecules heavy-heavy systems Bethe-Salpeter equation constant interaction resonance saturation 

分 类 号：O572.34[理学—粒子物理与原子核物理]