LHC Research W Bosons Produced For CP Violation In The Collision On

The Standard Model(SM) explains with great success almost all the experiment in particle physics, whichdescribes the elementary particles and the fundamental interactions in nature. It represents the most great achieve-ments of the whole physics in the20th century. But the SM itself has many open problems, among of which CP violation is the very importantance. In the SM, CP violation is classified into two types, the strong CP problem and the weak CP problem. The so-called strong CP problem means that the parameter involving in the QCD la-grangian is extremely small and less than10-9, as obtained by fitting with the data. The weak cp problem in the SM refers that the CP-violating effects described in terms of the quark mixing matrix is very small and it could not be used to explain the fact that there are much more matter than anti-matter in the universe. In the SM the CP-violating effects are very weak, so the cp-odd observables are sensitive to new physics. Therefore, the study of CP-violation could provide hints on the new physics beyond the standard model. When the energy scale of new physics is much more than the electroweak scale, the new physics effects at lowenergy can be described with an effective lagrangian. The effective lagrangian consists of a couple of hermitian operators containing only the SM particles with the real coupling constants. The operators and couplings can be classified according to the dimension of the new physics energy scale. In this paper,the CP-violation in the production of the W boson pairs at the LHC is studied. First, a CP-odd observable is constructed and the effective lagrangian describing the WWZ interactions with CP violation is followed, and then the variation of the CP-odd observable as a function of the CP-violating parameters and the parameter space for CP-violating parameters are given.