We argue that the heavy quark spin symmetry can lead to important consequences for heavy flavor hadronic molecules.It can be used to predict new heavy flavor hadronic molecules and hence provides a method to identify ...We argue that the heavy quark spin symmetry can lead to important consequences for heavy flavor hadronic molecules.It can be used to predict new heavy flavor hadronic molecules and hence provides a method to identify the nature of some newly observed exotic hadrons.For example,if the Y（4660） were an S-wave ψ f 0 （980） shallow bound state,then the mass,width and line shape of its spin partner are predicted.展开更多
We study the semileptonic decays of the lowest-lying bc baryons to the lowest-lying cc baryons （Ξ （＊） bc → Ξ （＊） cc and Ω （ ＊） bc → Ω （＊） cc ）,in the limit m b,m c Λ QCD and close to the zero reco...We study the semileptonic decays of the lowest-lying bc baryons to the lowest-lying cc baryons （Ξ （＊） bc → Ξ （＊） cc and Ω （ ＊） bc → Ω （＊） cc ）,in the limit m b,m c Λ QCD and close to the zero recoil point.The separate heavy quark spin symmetries make it possible to describe all these decays using a single form factor.We also show how these constraints can be used to test the validity of different quark model calculations.bb to bc baryon decays are also discussed.展开更多
Recently,the hidden charm tetraquark states Z_(cs)(3985)and Z_(cs)(4000)with strangeness were observed by the BESⅢ and LHCb collaborations,respectively,which are great breakthroughs for exploring exotic quantum chrom...Recently,the hidden charm tetraquark states Z_(cs)(3985)and Z_(cs)(4000)with strangeness were observed by the BESⅢ and LHCb collaborations,respectively,which are great breakthroughs for exploring exotic quantum chromodynamics(QCD)structures.The first and foremost question is whether they are the same state.In this work,we explore the implications of the narrower state Z_(cs)(3985)in BESⅢ and the wider one Z_(cs)(4000)in LHCb as two different states.Within a solvable nonrelativistic effective field theory,we include the possible violations of heavy quark spin symmetry and SU(3)flavor symmetry in a comprehensive approach.If Z_(cs)(3985)and Z_(cs)(4000)are two different states,our results show that Z_(cs)(4000)/Z_(cs)(3985)is the pure(|D_(s)^(*)D>+/-|D_(s)D^(*)>)/√2 state,and the SU(3)flavor partner of Zc(3900)is Z_(cs)(4000)rather than the Z_(cs)(3985).Another two important consequences are the existence of a tensor D_(s)^(*)D^(*) resonance with mass about 4126 MeV and width 13 MeV,and the suppression of the decay mode Z_(cs)(3985)J/ψK.The two consequences can be tested in experiments and distinguish the two-state interpretation from the one-state scheme.展开更多
基金Supported by Helmholtz Association through funds provided to the virtual institute 'Spin and strong QCD' (VH-VI-231)the DFG (SFB/TR 16,'Subnuclear Structure of Matter')the European Community-Research Infrastructure Integrating Activity 'Study of Strongly Interacting Matter' (acronym HadronPhysics2,Grant Agreement n.227431) under the Seventh Framework Programme of EU
文摘We argue that the heavy quark spin symmetry can lead to important consequences for heavy flavor hadronic molecules.It can be used to predict new heavy flavor hadronic molecules and hence provides a method to identify the nature of some newly observed exotic hadrons.For example,if the Y（4660） were an S-wave ψ f 0 （980） shallow bound state,then the mass,width and line shape of its spin partner are predicted.
基金Supported by DGI and FEDER funds (FIS2006-03438,FIS2008-01143/FIS)PIE-CSIC (200850I238)
文摘We study the semileptonic decays of the lowest-lying bc baryons to the lowest-lying cc baryons （Ξ （＊） bc → Ξ （＊） cc and Ω （ ＊） bc → Ω （＊） cc ）,in the limit m b,m c Λ QCD and close to the zero recoil point.The separate heavy quark spin symmetries make it possible to describe all these decays using a single form factor.We also show how these constraints can be used to test the validity of different quark model calculations.bb to bc baryon decays are also discussed.
基金This work was supported by the Spanish Ministerio de Ciencia e Innovación(MICINN)and the European Regional Development Fund(ERDF)under Contract PID2020-112777 GB-I00by the EU STRONG-2020 Project under the Program H2020-INFRAIA-2018–1 with Grant Agreement No.824093+4 种基金by Generalitat Valenciana under Contract PROMETEO/2020/023by the Chinese Academy of Sciences under Grant No.XDB34030000by the National Natural Science Foundation of China(NSFC)under Grants No.12125507,No.11835015,No.12047503,and No.11961141012by the NSFC and the Deutsche Forschungsgemeinschaft(DFG)through the funds provided to the Sino-German Collaborative Research Center TRR110“Symmetries and the Emergence of Structure in QCD”(NSFC Grant No.12070131001,DFG Project-ID 196253076)M.A.is supported by Generalitat Valenciana under Grant No.CIDEGENT/2020/002.
基金supported by the National Natural Science Foundation of China(11975033 and 12070131001)funded by the Deutsche Forschungsgemeinschaft(DFG,German Research Foundation,Project ID 196253076-TRR 110)supported by JSPS KAKENHI(20F20026)。
文摘Recently,the hidden charm tetraquark states Z_(cs)(3985)and Z_(cs)(4000)with strangeness were observed by the BESⅢ and LHCb collaborations,respectively,which are great breakthroughs for exploring exotic quantum chromodynamics(QCD)structures.The first and foremost question is whether they are the same state.In this work,we explore the implications of the narrower state Z_(cs)(3985)in BESⅢ and the wider one Z_(cs)(4000)in LHCb as two different states.Within a solvable nonrelativistic effective field theory,we include the possible violations of heavy quark spin symmetry and SU(3)flavor symmetry in a comprehensive approach.If Z_(cs)(3985)and Z_(cs)(4000)are two different states,our results show that Z_(cs)(4000)/Z_(cs)(3985)is the pure(|D_(s)^(*)D>+/-|D_(s)D^(*)>)/√2 state,and the SU(3)flavor partner of Zc(3900)is Z_(cs)(4000)rather than the Z_(cs)(3985).Another two important consequences are the existence of a tensor D_(s)^(*)D^(*) resonance with mass about 4126 MeV and width 13 MeV,and the suppression of the decay mode Z_(cs)(3985)J/ψK.The two consequences can be tested in experiments and distinguish the two-state interpretation from the one-state scheme.
