B介子及重子弱衰變中新物理唯象研究
[Abstract]:The standard model of particle physics (Standard Model, SM) has been proved to be the best theory to describe the strong interaction, the electromagnetic interaction and the weak interaction. Its prediction can almost withstand the test of all the experiments, especially the discovery of the Higgs boson. However, the standard model is not perfect, although it can break the weak symmetry of electricity. Rational explanation - Higgs mechanism, but only one of the scalar duality states responsible for the weak symmetry of electricity is not yet clear. In addition, there are some experimental observations that deviate from the prediction of the standard model, such as R (D (*)), RK and so on. These problems have left a certain space for the new physics (New Physics, NP) and the exploration of new physics. On the one hand, we can find new physical signals directly from high energy experiments, such as the large Large Hadron Collider (LHC) in Europe; on the other hand, it can be used to detect new physics indirectly through high luminance and accurate physical research, especially for the study of B physics, because low energy regions, though not directly, are not direct. New physics can be used to modify the physical process of low energy taste through a circle graph, which can detect new physical signs under high energy scale. This paper mainly studies the phenomenological effect of two new physical models in B meson decay, neutral B meson mixing and a B baryon decay. One of the new physics is double Higgs duality mode Two Higgs Doublet Model (2HDM) refers to the color eight gravity 2HDM under the hypothesis of minimum flavor (Minimal Flavor Violation, MFV); the other is Leptoquark (LQ) model, including two cases of scalar and vector. First, we introduce the significance and progress of the physics research in the first and the second Zhang Zhong, and the theoretical basis; Then, in the third chapter, the color eight gravity 2HDM is introduced. We systematically calculate the observable measurements of Bs, d0-Bs, and d0, Delta Ms, D, and, unlike the usual calculations, we consider the mass and momentum of the exterior line B quarks, and we have also calculated the average time integral branch of the pure light decay Bs and D to Mu + in the process of B (Bs, D to + + +). Considering the Z to BB, the radiation decay B to Xs gamma and B to K* (rho) gamma processes, we have a joint restriction on the parameters of the 2HDM. We find that these processes have a strong restriction on the Yukawa coupling coefficient ETA u, while the other Yukawa coupling ETA D is basically unrestricted, and there is no restriction on the number of the parameters in the Higgs potential. In addition, the multiplication and single lifting of the BB mesons are not limited. The process of radiation decay is different from the dependence of other considered processes on NP parameters, which can provide additional information. The scalar and vector LQ models can all explain the anomaly of the physical quantities R (D (*)) of the semi light decay B to D (*) tau (*). In the fourth and 52 chapters, we discuss the weak decay of the two LQ models in B mesons and Ab barons. The phenomenological effect. In the fourth chapter, we first examine the two sets of solutions in the scalar LQ model by removing the pure light decay of the Bc meson Bc- - tau - V, and then investigate the influence of the remaining two groups of solutions on the radiation decay Bc, tau [v], the half light decay B to D (*) tau [*], and the single lift half light decay B to Xc tau tau. We find the scalar LQ The remaining two sets of solutions of the model are almost all measured. Except for the longitudinal polarization of the D* meson and Tau Lepton and the asymmetry between the leptons and the leptons, the predictions of the relative standard models have a certain enhancement, and the two groups of solutions are difficult to make a phenomenological distinction. In the fifth chapter, we examine these two LQ models to be the same as from the B to C tau Tau The effect of the decay of the Ab baryon decay in the process of the decay of the Ab baryon - B - A - C tau, we find that these two LQ models have almost all the observations of the process, except the longitudinal polarization of the C baryon and Tau Lepton, and the predictions of the relative SM are almost the same, so the two LQ models are separated from the two groups of each LQ model. In theory, with the development of the Lattice QCD, the non perturbative parameters related to the strong interaction of the low energy region can be more accurately calculated, and many B physical processes will be predicted more reliably. In the experiment, the LHC, and the future super B factory SuperKEKB, will be brighter. Degree will be greatly improved, which can provide more examples of the production and decay of B mesons, and provide a good prospect for the study of B physics.
【學(xué)位授予單位】:華中師范大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2017
【分類號(hào)】:O572.2
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