Branching Ratio And CP Asymmetry Of B�'pη～(′) Decays In The Perturbative QCD Approach

As is well known,studying B physics,for both experimental measure and theoretical research ,has three major objectives:searching for CP violation and the evidence of new physics in B meson system,testing the theory of Standard Model and measuring the parameters in it, and studying the fruitful dynamics of QCD.The study of the two-body charmless hadronic B meson decays is a very important task in particle physics and a challenging subject for both theorists and experimentalists,and hence the study has very important academic values.In the study,one of the most difficulties is the calculation of hardronic matrix elements. There are many methods in dealing with this problem, such as naive factorization, QCD factorization approach, perturbative QCD (pQCD)factorization approach, etc.In this paper,the author calculates and analyzes four decay channels of B →ρη^' in the pQCD factorization approach,which based on k_T factorization in detail and gets some significative results.In the first two chapters, the author introduces the basic knowledge about the B meson physics,and the pQCD factorization approach and the CP violation etc.Starting with the effective theory, the author introduces the operator product expansion,and four-quark oper-ators,and the idea and method of pQCD approach briefly,and makes a comparison with the mentioned factorization approaches,and discusses the problems such as introduction of the transverse momentum k_T ,and Sudakov form factor, and the wave functions of mesons,and smearing the end-point divergence,etc.In the second two chapters,the author calculates and analyzes the branching ratios and the CP violation of the four B→ρη^' decay channels in the pQCD factorization approach in detail.Primary results are as following:(1) For the four decay channels of B →ρη^' the theoretical prediction of branching ratios in the pQCD factorization approach are well agree with the latest experimental datum;(2) For the four decay channels of B →ρη^' the CP violation,calculated in the pQCD approach, is in the range of experimental datum with errors.The author also gives the...