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LHT model top quark rare three-body decay t ¡ú cf ~-f process research

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Tutor: WangXueLei
School: Henan Normal
Course: Theoretical Physics
Keywords: Standard Model,LHT model,Branching ratio,Large Hadron Collider
CLC: O572.33
Type: Master's thesis
Year:  2011
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Abstract:
The standard model of particle physics (SM), is to describe the strong interaction between elementary particles and gauge theory of electroweak interactions. It created so far, has been for many physical phenomena gives the explanation, you can say that it is quite successful. However, in some fundamental issues, it does not give a satisfactory answer. Thus, particle physicists have made new model that tries to go beyond the standard model. In many new models, Littlest Higgs Model with T-Parity (LHT model) is one of the models we are more concerned about. LHT model is Littlest Higgs (LH) model based on the introduction of a discrete symmetry \In this model, most of the model parameters are almost consistent with the known experimental data. And the symmetry breaking energy scale f can be as low as 500GeV. In order to simultaneously achieve T-parity, LHT model introduces the SM for each fermion corresponding mirror fermions (T-odd quarks and T-odd leptons), at T-parity, the mirror fermion parity of the odd and is given a large mass. This can be in the standard model fermions and mirror fermions between the introduction of a new flavor-changing interactions, which will greatly increase the flavor changing coupling several flavor-changing contributions to the production and decay processes. These new flavor changing interactions in the search for new physics signals plays a crucial role. Top quarks are elementary particles in the electroweak scale under the heaviest fermion, relative to other fermions in terms of new physics is also more sensitive to it. Large Hadron Collider LHC has started running, at the annual intensity score was 10? 1 fb, is expected to be able to produce 10 7 - 108t (t | -) on the number of cases. This will provide us with many of the top quark-related data in order to allow our top quark precise nature of research. We studied in the LHT model top quark rare three-body decay process t ¡ú cf (f | -), and calculate the branching ratio of the detection range can reach the LHC. Our results showed that: (1) all processes branching ratios are strongly rely on third-generation heavy mirror quarks, and with the increase of its quality, the branching ratio significantly increased; (2) branching ratio was significantly dependent on the mixing matrix V Hd ; (3) for the process t ¡ú cb (b | -), whose branching ratio can be achieved in the ideal case detection range of the LHC.
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