Theoretical Study On Charmed Baryon Two-body Weak Decays

In recent years,with the promotion of BESIII,Belle and LHCb experiments,the experimen-tal research of charm physics has made a lot of achievements.At the same time,a lot of progress has been made in the theoretical study of charmed baryons.Many theoretical methods of charmed baryon weak decay,such as fitting,symmetry analysis and dynamics analysis,have been proposed.In this paper,the dynamics analysis method is used to study a kind of process of charmed baryons two body nonleptonic weak decay.We focus on a kind of process in charmed baryons two-body nonleptonic weak decays,especially those include a baryon and a pseudoscalar meson in the final states.In this paper,we firstly introduce the experimental and theoretical background of charmed baryons,and briefly introduce some recent experimental findings of baryons which contain a char-m quark.We use the topological-diagram approach to establish the overall theoretical framework.In other words,the topological-diagram approach is used to distinguish factorizable and nonfactor-izable contributions.Generally speaking,the complete contribution of a process can be divided into factorization and non-factorization.The emphasis of calculating the factorizable contribution is to calculate the form factor,while the pole model combined with current algebra is used to calculate the nonfactorizable contribution.This is the focus of this paper.We introduce the MIT bag model and the non-relativistic harmonic oscillator model.We obtain the quark space wave function by solving the Dirac equation of the central potential field,and then discuss the physical properties of MIT bag model,and use the quark model to calculate the nonperturbative parame-ters of the factorizable and nonfactorizable contributions,namely the form factors,baryon matrix elements and axial-vector form factors.We predict the decay branching ratio and spin asymmetry in the Cabibbo-favored,singly Cabibbo-suppresed and doubly Cabibbo-suppresed processes of all antitriplet and sextet baryons.We also systematically calculate the branching ratio and spin asym-metry of doubly charmed baryons in Cabibbo-favored processes.We have discussed our results in detail,and compared with the different theoretical predictions and experimental measurements.The theoretical predictions of?_c⁺?p?⁰,p?are consistent with the BESIII experiment.We also give some suggestions for finding doubly charmed baryons?_cc⁺⁺on LHCb.Some of the decay channels have no experimental results at present,therefore,it provides theoretical reference for experiments in the near future.