The Phenomenological Study Of B-Meson Non-Lepton Weak Decay

B meson physics provides a broad research space for testing standard models and searching for new physical signals.It is one of the frontier hotspots of particle physics theory and experimental research.This paper first introduces the standard model and B physics frontiers in Chapter 1,and then introduces the research method used in the paper—perturbation QCD method in Chapter 2,and introduces the specific calculation process of the perturbation QCD method.In Chapter 3,under the assumption that f0(980)and ? scalar meson are two quark ground states,the perturbation QCD method is used to study B0(+)? K0(2)*(1430)0(+)f0(980)(?)decay,the branching ratio of these decay channels are sensitive to the mixing angle of f0(980)and ?.After the calculation,combined with the experimental measurement results of the branch ratio,we found that the value of the mixing angle should be in the range of[135°,155°].When the mixing angle ?=145°,The predicted branch ratio of B0?K0(2)*(1430)0f0(980)is in good agreement with the experiment.In Chapter 4,the perturbation QCD method is used to study the resonance contribution of Bd,s???+?-decay with f0(980)and f2(1270)as the intermediate resonance states,using S wave and D wave two meson wave functions,the branch ratio of the corresponding decay channel,the CP asymmetry and the longitudinal polarization fraction are calculated.The obtained theoretical branch ratio of Bs??(f0(980)/f2(1270)?)?+?-decay is consistent with the measured value of LHCb within the error range.And based on the narrow width approximation,for Bd,s??(f2(1270)?)?0?0,Bd,s??(f2(1270)?)K+K-,The branch ratio of decay and the branch ratio of quasi-two-body decay Bd,s??f2(1270)have been estimated,which can be further tested in experiments.