Matter-antimatter asymmetry of b-quark and B-meson decays

This thesis works with the Standard Model, the quark model and the Factorization method. We investigate the decay rates of matter-antimatter of b quark and B meson decays. We presented the Standard Model for families of quarks at tree-level b decays b #-># q_iq_kq_j_-_b_a_r, q_i is an element of #left brace#u,c#right brace#, q_k is an element of #left brace#d,s#right brace#, q_j_-_b_a_r is an element of #left brace#u-bar, c-bar#right brace# without QCD correction. The gluonic penguin of hadronic b decays b #-># q_kg #-># q_kq_iq_j_-_b_a_r is studied through the Wilson coefficients of the effective Hamiltonian. Also we obtain the decay rates of tree plus penguin to compare with the effective Hamiltonian by current-current plus penguin operators. We describe effective Hamiltonian theory and apply this theory to the calculation of current-current (Q_1_,_2), QCD penguin (Q_3_,_._._._,_6), magnetic dipole (Q_8) and electroweak penguin (Q'_7_,_._._._,_1_0) decay rates. We defined the simple coefficients d_1_,_._._._,d_6_,_8 according to gluon penguin structure and used in the effective Hamiltonian theory. B mesons are bound states of a quark and a light quark. While the binding is provided by the strong interaction B mesons can decay by the weak interaction. The fact that only B mesons can be studied and not free b quarks complicate the extraction of Standard Model parameters from experimental results. Using the spectator quarks for the structuralization of the spectator model for the calculation of B meson decays. We show, in those decays in which two processes contribute to the same decay mode, that the two processes add coherently. Colour transparency is the basis for the factorization hypothesis, in which amplitudes factorize into products of two colour singlet current matrix elements. This ansatz has been widely used in heavy-quark physics, as it is almost the only way to treat exclusive hadronic decays. So we describe the factorization method for calculation of leptonic, semileptonic and nonleptonic B meson decays as well. We compared the B , D and K mesons and have an isospin analysis of the spectator model for various decays. Also we calculated the decay rates of charm quark, W-exchange and W-annihilation for B and D meson. We show that, the W-annihilation term is small for B and D mesons, but W-exchange term is small for B but larger for D mesons. (author)SIGLEAvailable from British Library Document Supply Centre-DSC:DXN037547 / BLDSC - British Library Document Supply CentreGBUnited Kingdo