The transformation between physical bases and symmetry bases is extendedfrom SU_f^2 to SU_f^3.Its application in dibaryon calculation for both nonrelativistic andrelativistic quark model is discussed.
Promising high strangeness dibaryons are studied by the extended quark delocalization and color screeningmodel. It is shown that besides H particle and di-Ω, there might be other dibaryon candidates worth to be searc...Promising high strangeness dibaryons are studied by the extended quark delocalization and color screeningmodel. It is shown that besides H particle and di-Ω, there might be other dibaryon candidates worth to be searchedexperimentally such as NΩ.展开更多
The gluon and Goldstone boson induced tensor interaction effect on the dibaryon mass and the D-wave decay width has been studied in the quark delocalization, color screening model. The effective S-D wave transition in...The gluon and Goldstone boson induced tensor interaction effect on the dibaryon mass and the D-wave decay width has been studied in the quark delocalization, color screening model. The effective S-D wave transition interactions induced by gluon and Goldstone boson exchanges decrease quickly as the increasing of the channel strangeness. The K and η meson tensor contribution is negligible in this model. No six-quark state in the light flavor world can become a bound one by the help of these tensor interactions except the deuteron. The partial D-wave decay width of Ijp = 1/2 2+NΩ state to spin 0, 1 ∧([1]) final state is 20.7 keV and 63.1 keV respectively. It is a very narrow dibaryon resonance and might be detected in the relativistic heavy ion reaction by the existing RHIC detectors through the reconstruction of the ∧([1]) vertex mass and the future COMPAS detector at CERN and FAIR project in Germany.展开更多
In this study,we investigate the two step sequential one pion production mechanism,that is,np(I=0)→π^(-)pp followed by the fusion reaction pp→π^(+)d,to describe the np→π^(+)π^(-)d reaction withπ^(+)π^(-)in st...In this study,we investigate the two step sequential one pion production mechanism,that is,np(I=0)→π^(-)pp followed by the fusion reaction pp→π^(+)d,to describe the np→π^(+)π^(-)d reaction withπ^(+)π^(-)in state I=0.In this reaction,a narrow peak identified with a"d(2380)"dibaryon has been previously observed.We discover that the second reaction step pp→π^(+)d is driven by a triangle singularity that determines the position of the peak of the reaction and the high strength of the cross section.The combined cross section of these two mechanisms produces a narrow peak with a position,width,and strength,that are compatible with experimental observations within the applied approximations made.This novel interpretation of the peak accomplished without invoking a dibaryon explains why this peak has remained undetected in other reactions.展开更多
In this work,we study the doubly charmed dibaryon states with the qqqqcc(q=u,d,s)configuration.The mass spectra of doubly charmed dibaryon states are obtained systematically within the chromomagnetic interaction model...In this work,we study the doubly charmed dibaryon states with the qqqqcc(q=u,d,s)configuration.The mass spectra of doubly charmed dibaryon states are obtained systematically within the chromomagnetic interaction model.In addition to the mass spectrum analysis,we illustrate their two-body strong decay behaviours.Our results suggest that there may be narrow states or even stable states that cannot decay through the strong interaction.We hope that our results will provide valuable information for further experimental searches for doubly charmed dibaryon states.展开更多
In this paper,we propose to investigate the d_(NΩ)dibaryon production in the K-p-→d_(NΩ)≡0 process by utilizing a kaon beam with a typical momentum of approximately 10 GeV,which may be available at COMPASS,OKA@U-7...In this paper,we propose to investigate the d_(NΩ)dibaryon production in the K-p-→d_(NΩ)≡0 process by utilizing a kaon beam with a typical momentum of approximately 10 GeV,which may be available at COMPASS,OKA@U-70,and SPS@CERN.The cross sections for K-p-→d_(NΩ)=O are estimated,and in particular,the magnitude of the cross sections is evaluated to be several hundred nanobarns at Pk=20 GeV.Considering that the d_(NΩ)dibaryon dominantly decays into≡Λand≡∑,we also estimate the cross sections for K-p→≡0Λ≡0 and K~p→≡-∑+≡0,where the d_(NΩ)dibaryon can be observed in the invariant mass distributions of≡0Λand≡-∑+,respectively.展开更多
We take the model space of the two-baryon system as |NN】+|N△】|πNN】. The model space is separated into P（P<sub>N</sub>+P<sub>△</sub>） space |NN】+|N△】, and Q space|πNN】, and these tw...We take the model space of the two-baryon system as |NN】+|N△】|πNN】. The model space is separated into P（P<sub>N</sub>+P<sub>△</sub>） space |NN】+|N△】, and Q space|πNN】, and these two spaces are coupled by the vertex V<sub>(</sub>z.N△.By eliminating the Q space, the effective interaction in the P space is given展开更多
The NΔ and ΔΔ dibaryon resonances are studied by calculating the NN scattering phase shifts with explicitly coupling these dibaryon channels in a multi-channel coupling calculation with two quark models. These quar...The NΔ and ΔΔ dibaryon resonances are studied by calculating the NN scattering phase shifts with explicitly coupling these dibaryon channels in a multi-channel coupling calculation with two quark models. These quark models,the chiral quark model and quark delocalization color screening model,describe the NN S-,D-wave phase shifts below the π production threshold quantitatively well. Both quark models predict the 1D2 resonance discovered in NN partial wave phase shift analysis and the J=1 or 3 isoscalar resonance recently reported by CELSIUS-WASA Collaboration are NΔ5S2 and ΔΔ7S3 resonance,respectively. Further measurements at COSY,LEPS and Lanzhou Cooling Storage Ring(CSR) to check the ΔΔ resonance are discussed.展开更多
In the framework of the constituent quark model, the possible S-wave heavy dibaryon states with the c flavor are investigated. The factors which are responsible for the binding behavior of the dibaryon system are anal...In the framework of the constituent quark model, the possible S-wave heavy dibaryon states with the c flavor are investigated. The factors which are responsible for the binding behavior of the dibaryon system are analyzed. It is shown that both the symmetry character of the system and the energy of interactions between interacting quarks are important for the binding behavior of the two-baryon system with the heavy flavor. As a result, seven possible candidates of heavy dibaryons with c flavor are predicted.展开更多
Hexaquarks constitute a natural extension of complex quark systems,just as tetra-and pentaquarks do.To this end,the current status of d^(*)(2380)in both experiment and theory is reviewed.Recent high-precision meas-ure...Hexaquarks constitute a natural extension of complex quark systems,just as tetra-and pentaquarks do.To this end,the current status of d^(*)(2380)in both experiment and theory is reviewed.Recent high-precision meas-urements in the nucleon-nucleon channel and analyses thereof have established d^(*)(2380)as an indisputable reson-ance in the long-sought dibaryon channel.Important features of this I(J^(P))=0(3^(+))state are its narrow width and deep binding relative to the 0(1232)0(1232)threshold.Its decay branchings favor theoretical calculations predict-ing a compact hexaquark nature of this state.We review the current status of experimental and theoretical studies on d^(*)(2380)as well as new physics aspects it may bring in future.In addition,we review the situation at the 0(1232)N and N^(*)(1440)N thresholds,where evidence for a number of resonances of presumably molecular nature has been found-similar to the situation in charmed and beauty sectors.Finally,we briefly discuss the situation of dibaryon searches in the flavored quark sectors.展开更多
We investigate the exotic ΩΩ dibaryon states with J^(P)=0^(+)and 2^(+)in a molecular picture.We construct a tensorΩΩmolecular interpolating current and calculate the two-point correlation function within the metho...We investigate the exotic ΩΩ dibaryon states with J^(P)=0^(+)and 2^(+)in a molecular picture.We construct a tensorΩΩmolecular interpolating current and calculate the two-point correlation function within the method of QCD sum rules.Our calculations indicate that the masses of the scalar and tensor dibaryon states are mΩΩ,0^(+)=(3.33±0.51)GeV and mΩΩ,2^(+)=(3.15±0.33)GieV,respectively,which are below the 2mΩthreshold.Within error,these results do not negate the existence of loosely bound molecularΩΩdibaryon states.These exotic strangeness S=-6 and doubly-chargedΩΩdibaryons,if they exist,may be identified in heavy-ion collision processes in the fu-ture.展开更多
The dibaryon concept for nuclear force is presented,assuming that the attraction between nucleons at medium distances is mainly due to the s-channel exchange of an intermediate six-quark(dibaryon)state.To construct th...The dibaryon concept for nuclear force is presented,assuming that the attraction between nucleons at medium distances is mainly due to the s-channel exchange of an intermediate six-quark(dibaryon)state.To construct the respective NN interaction model,a microscopic six-quark description of the NN system is used,in which symmetry aspects play a special role.It is shown that the NN interaction in all important partial waves can be described by the superposition of long-range t-channel one-pion exchange and s-channel exchange by an intermediate dibaryon.The model developed in this study provides a good description of both elastic phase shifts and inelasticities of NN scattering in all S,P,D,and F partial waves at energies from zero to 600-800 MeV and even higher.The parameters of the intermediate six-quark states,corresponding to the best fit of NN scattering data,are found to be consistent with the parameters of the known dibaryon resonances in those NN partial configurations,where their existence has been experimentally confirmed.Predictions for new dibaryon states are given as well.展开更多
基金The project supported by the NSFC,National Education Committee FundNational ScienceTechnology Committee FundJiangsu Province Education Committee Youth Fund.
文摘The transformation between physical bases and symmetry bases is extendedfrom SU_f^2 to SU_f^3.Its application in dibaryon calculation for both nonrelativistic andrelativistic quark model is discussed.
基金The project supported by National Natural Science Foundation of China under Grant No.90103018
文摘Promising high strangeness dibaryons are studied by the extended quark delocalization and color screeningmodel. It is shown that besides H particle and di-Ω, there might be other dibaryon candidates worth to be searchedexperimentally such as NΩ.
文摘The gluon and Goldstone boson induced tensor interaction effect on the dibaryon mass and the D-wave decay width has been studied in the quark delocalization, color screening model. The effective S-D wave transition interactions induced by gluon and Goldstone boson exchanges decrease quickly as the increasing of the channel strangeness. The K and η meson tensor contribution is negligible in this model. No six-quark state in the light flavor world can become a bound one by the help of these tensor interactions except the deuteron. The partial D-wave decay width of Ijp = 1/2 2+NΩ state to spin 0, 1 ∧([1]) final state is 20.7 keV and 63.1 keV respectively. It is a very narrow dibaryon resonance and might be detected in the relativistic heavy ion reaction by the existing RHIC detectors through the reconstruction of the ∧([1]) vertex mass and the future COMPAS detector at CERN and FAIR project in Germany.
基金support from the CIDEGENT program with Ref.CIDEGENT/2019/015from the spanish national grant PID2019-106080GB-C21+3 种基金partly supported by JSPS Overseas Research FellowshipsJSPS KAKENHI Grant Number JP19K14709partly supported by the Spanish Ministerio de Economia y Competitividad and European FEDER funds under Contracts No.FIS2017-84038-C2-1-P B and No.FIS2017-84038-C2-2-P Bfunding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No.824093 for the STRONG-2020 project。
文摘In this study,we investigate the two step sequential one pion production mechanism,that is,np(I=0)→π^(-)pp followed by the fusion reaction pp→π^(+)d,to describe the np→π^(+)π^(-)d reaction withπ^(+)π^(-)in state I=0.In this reaction,a narrow peak identified with a"d(2380)"dibaryon has been previously observed.We discover that the second reaction step pp→π^(+)d is driven by a triangle singularity that determines the position of the peak of the reaction and the high strength of the cross section.The combined cross section of these two mechanisms produces a narrow peak with a position,width,and strength,that are compatible with experimental observations within the applied approximations made.This novel interpretation of the peak accomplished without invoking a dibaryon explains why this peak has remained undetected in other reactions.
基金Supported by the China National Funds for Distinguished Young Scientists(11825503)the National Key Research and Development Program of China(2020YFA0406400)+2 种基金the 111 Project(B20063)the National Natural Science Foundation of China(12175091,11965016,12247101,12047501)the project for topnotch innovative talents of Gansu province。
文摘In this work,we study the doubly charmed dibaryon states with the qqqqcc(q=u,d,s)configuration.The mass spectra of doubly charmed dibaryon states are obtained systematically within the chromomagnetic interaction model.In addition to the mass spectrum analysis,we illustrate their two-body strong decay behaviours.Our results suggest that there may be narrow states or even stable states that cannot decay through the strong interaction.We hope that our results will provide valuable information for further experimental searches for doubly charmed dibaryon states.
基金Supported by the National Natural Science Foundation of China(11705056,12175037,11947224,11475192,11975245,U1832173)the Key Project of Hunan Provincial Education Department(21A0039)+3 种基金the State Scholarship Fund of China Scholarship Council(202006725011)the Sino-German CRC 110"Symmetries and the Emergence of Structure in QCD"project by NSFC(12070131001)the Key Research Program of Frontier Sciences,CAS(Y7292610K1)the National Key ResearchandDevelopment Programof China(2020YFA0406300)。
文摘In this paper,we propose to investigate the d_(NΩ)dibaryon production in the K-p-→d_(NΩ)≡0 process by utilizing a kaon beam with a typical momentum of approximately 10 GeV,which may be available at COMPASS,OKA@U-70,and SPS@CERN.The cross sections for K-p-→d_(NΩ)=O are estimated,and in particular,the magnitude of the cross sections is evaluated to be several hundred nanobarns at Pk=20 GeV.Considering that the d_(NΩ)dibaryon dominantly decays into≡Λand≡∑,we also estimate the cross sections for K-p→≡0Λ≡0 and K~p→≡-∑+≡0,where the d_(NΩ)dibaryon can be observed in the invariant mass distributions of≡0Λand≡-∑+,respectively.
基金Project supported by the National Natural Science Foundation of China.
文摘We take the model space of the two-baryon system as |NN】+|N△】|πNN】. The model space is separated into P（P<sub>N</sub>+P<sub>△</sub>） space |NN】+|N△】, and Q space|πNN】, and these two spaces are coupled by the vertex V<sub>(</sub>z.N△.By eliminating the Q space, the effective interaction in the P space is given
基金National Natural Science Foundation of China(90503011,10375030,10435080,10775072)
文摘The NΔ and ΔΔ dibaryon resonances are studied by calculating the NN scattering phase shifts with explicitly coupling these dibaryon channels in a multi-channel coupling calculation with two quark models. These quark models,the chiral quark model and quark delocalization color screening model,describe the NN S-,D-wave phase shifts below the π production threshold quantitatively well. Both quark models predict the 1D2 resonance discovered in NN partial wave phase shift analysis and the J=1 or 3 isoscalar resonance recently reported by CELSIUS-WASA Collaboration are NΔ5S2 and ΔΔ7S3 resonance,respectively. Further measurements at COSY,LEPS and Lanzhou Cooling Storage Ring(CSR) to check the ΔΔ resonance are discussed.
基金Supported by National Natural Science Foundation of China (10775147)CAS Knowledge Innovation Key-Project(KJCX2SWN02)
文摘In the framework of the constituent quark model, the possible S-wave heavy dibaryon states with the c flavor are investigated. The factors which are responsible for the binding behavior of the dibaryon system are analyzed. It is shown that both the symmetry character of the system and the energy of interactions between interacting quarks are important for the binding behavior of the two-baryon system with the heavy flavor. As a result, seven possible candidates of heavy dibaryons with c flavor are predicted.
基金This work has been supported by DFG(CL 214/3-3)H.Cl.appreciates the support by the Munich Institute for Astro-and Particle Physics(MIAPP)which is funded by the Deutsche Forschungsgemeinschaft(DFG,German Research Foundation)under Germany's Excellence Strategy-EXC-2094-390783311。
文摘Hexaquarks constitute a natural extension of complex quark systems,just as tetra-and pentaquarks do.To this end,the current status of d^(*)(2380)in both experiment and theory is reviewed.Recent high-precision meas-urements in the nucleon-nucleon channel and analyses thereof have established d^(*)(2380)as an indisputable reson-ance in the long-sought dibaryon channel.Important features of this I(J^(P))=0(3^(+))state are its narrow width and deep binding relative to the 0(1232)0(1232)threshold.Its decay branchings favor theoretical calculations predict-ing a compact hexaquark nature of this state.We review the current status of experimental and theoretical studies on d^(*)(2380)as well as new physics aspects it may bring in future.In addition,we review the situation at the 0(1232)N and N^(*)(1440)N thresholds,where evidence for a number of resonances of presumably molecular nature has been found-similar to the situation in charmed and beauty sectors.Finally,we briefly discuss the situation of dibaryon searches in the flavored quark sectors.
基金Supported by the National Natural Science Foundation of China (11722540, 12075019)the Fundamental Research Funds for the Central Universitiesthe National Key Research and Development Program of China (2020YFA0406400).
文摘We investigate the exotic ΩΩ dibaryon states with J^(P)=0^(+)and 2^(+)in a molecular picture.We construct a tensorΩΩmolecular interpolating current and calculate the two-point correlation function within the method of QCD sum rules.Our calculations indicate that the masses of the scalar and tensor dibaryon states are mΩΩ,0^(+)=(3.33±0.51)GeV and mΩΩ,2^(+)=(3.15±0.33)GieV,respectively,which are below the 2mΩthreshold.Within error,these results do not negate the existence of loosely bound molecularΩΩdibaryon states.These exotic strangeness S=-6 and doubly-chargedΩΩdibaryons,if they exist,may be identified in heavy-ion collision processes in the fu-ture.
基金partially supported by RFBR,grants Nos.19-02-00011 and 19-02-00014support from the Foundation for the Advancement of Theoretical Physics and Mathematics“BASIS”。
文摘The dibaryon concept for nuclear force is presented,assuming that the attraction between nucleons at medium distances is mainly due to the s-channel exchange of an intermediate six-quark(dibaryon)state.To construct the respective NN interaction model,a microscopic six-quark description of the NN system is used,in which symmetry aspects play a special role.It is shown that the NN interaction in all important partial waves can be described by the superposition of long-range t-channel one-pion exchange and s-channel exchange by an intermediate dibaryon.The model developed in this study provides a good description of both elastic phase shifts and inelasticities of NN scattering in all S,P,D,and F partial waves at energies from zero to 600-800 MeV and even higher.The parameters of the intermediate six-quark states,corresponding to the best fit of NN scattering data,are found to be consistent with the parameters of the known dibaryon resonances in those NN partial configurations,where their existence has been experimentally confirmed.Predictions for new dibaryon states are given as well.
