Non-perturbative Mechanisms In The Production And Decay Of Charmouine And Charmouine-like Compound

Charmonium energy physics is an important research field in particle physics.In recent years,many charmonium-like states have been observed experimentally.The productions and decays of these states are of great importance for the study of the nonperturbative properties of Quantum Chromodynamics(QCD).It is a long history for exploring the inner structure of matter,which is also the establishment and development process of particle physics.In this thesis,I first review the history of particle physics,the QCD theory and Quark model.In Chapter 2,I introduce the theoretical methods and models used in our research,which mainly include the heavy quark effective theory,chiral perturbation theory,nonrelativistic effective field theory(NREFT)and intermediate hadron loop model(IML).In Chapter 3,I mainly present our investigation on the effects of heavy meson loops on higher charmonia radiative transitions.We systematically investigated these radiative transitions of Ψ/(nS)→γχcJ(mP)and Ψ(nD)→γχcJ(mP)via intermediate charmed meson loop with NREFT.We present the line-shape behaviors of the distributions via different intermediate meson loops.We only focus on the line-shape behavior of the distributions via different intermediate meson loops.Our results show that the coupled channel effects of these decays are relatively weak,while the coupled channel effects has obvious enhancement when the inial(final)states are closed to the thresholds of charmed mesons pair.The coupled-channel effects in the channels of excited states should be testable experimentally in the future.In Chapter 3,I mainly present our investigation on the production of hidden charm and open strange states.We investigated the production of Zcs+ in B+ and Bs0 decays,where Zcs+ is assigned as a Ds+D*0+Ds*+D0 molecular state.By using an effective Lagrangian approach,we evaluate the branching ratio of Bs0→K-Zcs+ and B+→φZcs+ via the triangle loop mechanism.The estimated branching fractions of Bs0→K-Zcs+ and B+→φZcs+ are found to be order of an order of 10-4 and 10-5,respectively.The ratio of these two branching fraction is estimated to be about 4,which indicates that the Bs0→K-Zcs+→K+K-J/Ψ may be a better process of searching Zcs and accessible for further experimental measurement of the BelleⅡ and LHCb collaborations.In the last section,we present a short summary and look forward to the research prospect of new hadron states.