Charmed Baryon Decays Involving Decuplet Baryon In The Quark-diagram Scheme

The charmed baryon decays is the necessary component of particle physics in Heavy Flavor Physics.It helps us understand the hadronization effect in the decay process.In the quark-diagram scheme,we study the charmed baryon decays of Bc ? B*M,where Bc is?_c⁺ or ?c+(0),together with B*(M)the decuplet baryon(pseudoscalar meson).The first part introduces the research background and significance of charmed baryon decays,and points out the current research status.Several experts and teachers have made some theoretical attempts on charmed baryon decays.Finally,the quark-diagram scheme will be introduced,and the main content of this paper will be briefly represented.In the second part,as the theoretical support of this paper,we understand the basic composition of matter and its discovery process.Secondly,the origin of quarks is derived,and the standard model including quarks,leptons,vectors and interaction forces is introduced.Finally,the quark-diagram scheme is used to specifically describe the charmed baryon decay of the two bodies,and the expression of its branch ratio formula is analyzed.The third and fourth parts are the core contents.Under the irreducible SU(3)_flavor symmetry study,The decays amplitude of the Be?B*M have four parameters.In the quark-diagram scheme,we find that only two W-exchange processes are allowed to contribute to B_c?B^*M.In the comparison of the two methods,We note that the quark-diagram scheme can accommodate SU(3)defects and explain experiments more effectively.The charmed baryon decays to decuplet baryons with obvious flavor symmetry breaking.Finally,we predict B(A_c⁺??^*0(+)?⁺⁽⁰⁾)=(2.8±0.4)×10^-3,which fully proves the symmetry of isospin.Besides,we take into account the SU(3)_flavor symmetry breaking,in order to explain the observation of B(?_c⁺??*+?).For the decays involving ?⁺⁺(uuu),we predict B(?_c⁺??⁺⁺?-,?_c⁺??⁺⁺K^-)=(7.0±1.4,13.5±2.7)×10^-4 as the largest branching fractions in the singly Cabibbo-suppressed decay channels,respectively,which are accessible to the LHCb,BELLEII and BESIII experiments.In the fifth part,the thesis is summarized and the research methods used in this paper are prospected.We have done some work on three-body decay,such as ?_c⁺?BMM,where B is octet baryon together with MM the meson pair.Theoretically,?_c⁺?BMM have fourteen quark topologies.In addition,we note the consistency of the irreducible SU(3)_flavor symmetry and quark topological image methods,but the quark-diagram scheme can accommodate SU(3)defects and explain experiments more effectively.Thus,there is reason to think that there is a similar consistency in other decay modes,especially the recent decaying of B_c?BM,where B isthe baryon of spin 1/2.We expect that the existing experimental data of B_c?BM can be interpreted and multiple decays can be predicted,which will be the future direction of our research.