The Study For The Natures Of Singly Heavy Flavor Baryons Under The Quenched And Unquenched Pictures

The singly heavy flavor baryon is an important member in hadron families.With the efforts of LHCb,Belle,CLEO,BaBar,CDF,CMS,et al.,more and more singly heavy flavor baryons were observed.These observations play important roles for understanding the structures of hadrons and the quark-quark interactionsIn 2019,the LHCb Collaboration observed two ?b0 excited states:?b(6146)0 and?b(6152)0.This discovery presented us a good chance to study the bottom baryons.In this work,we investigate the ?b(6146)0 and ?b(6152)0 both on mass spectrum and decay behaviors.Our calculations imply that the ?b(6146)0 and ?b(6152)0 are two good ?b(1D)0 candidates.Since our model has achieved great success in dealing with Ab(6146)0 and Ab(6152)0,we could employ the same approach for the decay width calculations of bottom baryons(?),and which are still not observed in experiments.Our calculations of total widths and branch ratios for states will provide valuable references for future experiments.The above calculations for bottom baryons are based on the quenched pictures.Many previous theoretical works have implied that the quenched picture is very successful for singly heavy flavor baryons.But among these singly heavy flavor baryons,the mass of the Ac(2940)+is about 60?100 MeV below the potential model calculations.In order to interpret the mass of the Ac(2940)+,we introduce the coupled-channel effects under the unquenched picture.In the calculation,the mass of the ?c(2940)+is well understood with the coupled-channel effect from the interaction between the bare state of ?c(2940)+and D*N.The study for the ?c(2940)+implies that the coupled-channel effects play important roles in understanding the natures of the singly heavy flavor baryons.We then naturally ask a question that could we find more singly heavy flavor baryon states which are similar as the ?c(2940)+.According to the heavy quark flavor symmetry,the ?+cand ?b0 may contain similar natures.Because our model has achieved success for the interpretation of the ?c(2940)+,we could extend the calculations from the ?c(2940)+ to the ?b(2P)0.With the coupled-channel effects,the masses of ?b(2P,1/2-)0 and ?b(2P,3/2-)0 shift down about 70 MeV and 50 MeV,respectively.The results imply that Ab(2P)0 also have obvious coupled-channel effect,which can be tested with the experiments by the LHCb,CMS,et al.in the future.Then we also study the the properties of the charmed-strange baryon ?c(1P)under the coupled-channel effects.In the calculations,the coupled-channel effects from the interactions between the ?c(1P)and the(?)are introduced.We find that there exist obvious coupled-channel effects in ?cd(1P,1/2-),which mass shifts down about 90 MeV by this mechanism.This result implies that the coupled-channel effects also play important roles in the ?c(1P).Finally,we study the spectroscopies of the singly heavy flavor baryons under the heavy quark symmetry and SU(3)flavor symmetry.Without counting the isospin multiplets,there are nearly 50 singly heavy flavor baryons observed in experiments,which contain about 31 charmed baryons and 19 bottom baryons.Based on these experimental data,we could study the behaviors of the singly heavy flavor baryon spectroscopies.We find that the ?-mode excited ?Q and ?Q have similar excited energies.The similar results also could be found in ?Q,?'Q and ?Q.In this work,we not only explain the phenomenon with the quark model,but also employ the behavior to study the mass spectra of the miss singly heavy flavor baryons in experiments.Very recently,the CMS Collaboration observed a?b excited state,i.e.,?b(6100).This is a good ?b(1P)candidate and its mass is consistent with our calculation.For completeness,we also discuss the properties of the spectroscopies in p-mode excited singly heavy flavor baryons.