物理学进展2021，Vol.41Issue(2)：65-93,29.DOI:10.13725/j.cnki.pip.2021.02.001
正反重强子对构成的强子分子态能谱
A survey of heavy-antiheavy hadronic molecules
摘要
Abstract
Many efforts have been made to reveal the nature of the overabundant resonant structures observed by the worldwide experiments in the last two decades.Hadronic molecules attract special attention because many of these seemingly unconventional resonances are located close to the threshold of a pair of hadrons.To give an overall feature of the spectrum of hadronic molecules composed of a pair of heavy-antiheavy hadrons,namely,which pairs are possible to form molecular states,we take charmed hadrons for example to investigate the interaction between them and search for poles by solving the Bethe-Salpeter equation.We consider all possible combinations of hadron pairs of the S-wave singly-charmed mesons and baryons as well as the narrow P-wave charmed mesons.The interactions,which are assumed to be meson-exchange saturated,are described by constant contact terms which are resummed to generate poles.It turns out that if a system is attractive near threshold by the light meson exchange,there is a pole close to threshold corresponding to a bound state or a virtual state,depending on the strength of interaction and the cutoff.In total,229 molecular states are predicted.The observed near-threshold structures with hidden-charm,like the famous X(3872) and Pc states,fit into the spectrum we obtain.We also highlight a Λc/(Λ)c bound state that has a pole consistent with the cross section of the e+e-→ Λc(Λ)c precisely measured by the BESIII Collaboration.关键词
强子分子态/奇特强子态/隐粲系统/极点Key words
Hadronic molecules/exotic hadrons/hidden-charm systems/poles分类
信息技术与安全科学引用本文复制引用
董相坤,郭奉坤,邹冰松..正反重强子对构成的强子分子态能谱[J].物理学进展,2021,41(2):65-93,29.基金项目
We would like to thank Chang-Zheng Yuan for useful discussions,and thank Fu-Lai Wang for a communication regarding Ref.[218].This work is supported in part by the Chinese Academy of Sciences (CAS) under Grant No.XDB34030000 and No.QYZDB-SSW-SYS013,by the National Natural Science Foundation of China (NSFC) under Grant No.11835015,No.12047503 and No.11961141012,by the NSFC and the Deutsche Forschungsgemeinschaft (DFG,German Research Foundation) through the funds provided to the Sino-German Collaborative Research Center TR-R110 "Symmetries and the Emergence of Structure in QCD" (NSFC Grant No.12070131001,DFG Project-ID 196253076),and by the CAS Center for Excellence in Particle Physics (CCEPP). （CAS）
