Direct CP Violation In B~+?D_±?~+And Baryon Of ?_b~0

CP violation is an important research topic in particle physics.Although it has been discovered for more than 50 years,our understanding of CP violation is still relatively limited.The study of CP violation in the process of heavy taste hadron decay is an important part of the current research on flavor physics,and it is also an important place for research on CP violation.The decay process of the bottom hadrons is a hot field in CP violation research.On the one hand,the large CP violation found in experiments at present are from the B system;on the other hand,theoretical analysis shows that there may also be large CP violation in the bottom-baryon system.In this thesis,theoretical study on the CP violation phenomena of the B meson decay channels B+?D±?+ and ?b0??0D±is conducted.On the theoretical side,one of the core contents of research on hadron decay is the calculation of hadron decay matrix elements.Common approaches include naive factorization approach,QCD factorization approach,perturbative QCD factorization approach,and Soft-Collinear Effective Theory.Using the naive factorization approach,this paper first conducts a theoretical study on the CP violation B+?D±?+ decay.Combined with the CP violation given in the experiment,the phase angle of the B+?D+?+ process is extracted and applied to the B+?D-?+ decay process.The calculated CP violation is 0.0082±0.0026 and 0.0079±0.0026.In addition,the QCD factorization method was used to study theoretically on CP violation in the process of ?b0??0D±.Studies have shown that the CP violation in this baryon decay process has a high probability of being discovered experimentally.This thesis is organized as follows.The first chapter introduces the theoretical and experimental research background of CP violation;the second chapter introduces the Standard Model and CP violation;the third chapter introduces three factorization methods and the calculation of hadron matrix elements;the fourth chapter shows B+?S+?+ theoretical calculation of direct B+?D+?+ during decay;Chapter 5 presents the research on CP violation of ?b0??0D±;Chapter 6 is the summary of this thesis.