Exotic Dibaryon And The Effect Of Hidden-Color Channel

Exotic dibaryon is an important place to study the nonperturbation effects of quantum chromodynamics（QCD）,which is believed the fundamental theory of strong interactions.Therefore,both experimentally and theoretically,the search for the light and heavy dibaryons has attracted worldwide attention.The chiral SU（3）quark model is one of the theoretical models with the QCD-spirit.By using this model,the properties of the baryon ground state and deuteron and the scattering experiments of nucleon-nucleon（NN）and hyperon-nucleon（NY）can be described reasonably,and the binding energy of d^*（2380）is predicted to be 84 MeV,which is exactly consistent with the conclusion of WASA-at-COSY experimental group.We also find that the hidden-color channel（CC）plays a key role in the formation of d^*（2380）system.All of our calculated results demonstrate the rationality and validity of the chiral SU（3）quark model.Naturally,it is suitable to further predict the possible existence of dibaryons,while the CC channel should be included.Therefore,we continue to use the chiral SU（3）quark model and take into account the hiddencolor channel,and extend the study of the dibaryons with strange quarks to charm quarks and bottom quarks.The main work includes the following aspects:1.Within the chiral SU（3）quark model,we use the resonating group method and consider the coupling from CC channel,to investigate the one strange quark ∑^*Δ system with spin 0 and 3.2.Extending into spin 0 systems,including Ξ^*Ω with five strange quarks and ΩΩ with six strange quarks.3.Further extending into charm dibaryons.First we construct the wave function of CC channel and evaluate all the spin-flavor-color matrix elements of ∑_c^*Δ and Ω_cccΩ_ccc systems,Then the dynamics calculation of charm dibaryons is carried out.4.Similarly,we extend into bottom dibaryons.First we construct the wave function of CC channel and evaluate all the spin-flavor-color matrix elements of ∑_b^*Δ and Ω_bbbΩ_bbb systems.Then the dynamics calculation of bottom dibaryons is carried out.The calculated results show that:1.For low strangeness-1 systems,∑^*Δ with spin S=0 and S=3,both can become boundstates.The binding energies are tens of MeV,in which the CC channels play an important role in the formation of bound states.2.For high strangeness-5 and-6 systems,Ξ^*Ω and ΩΩ with spin S=0,both can form bound states.Each is with a binding energy of larger than 100 MeV as a deeply bound state,and is mainly due to the strong attraction from scalar σ mesons,and the effect from CC channel is relatively small.3.For charm dibaryons,∑_C^*Δ with spin S=0 and S=3,both can form bound states and the effect from CC channel is small.Ω_cccΩ_ccc system can also become bound state,however,the effect from CC channel is relatively large,whether it involves other interaction mechanisms still need to be investigated.4.For bottom dibaryon,∑_b^*Δ with spin S=0 and S=3,both can form bound states and the effect from CC channel is also small.Similarly,Ω_bbbΩ_bbb system can also become bound state and the effect from CC channel is relatively large,whether it involves other interaction mechanisms are in investigation.5.When the color screening potentials are considered for strange,charm and bottom dibaryons,the properties of bound states are not changed.