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Z ' models under the flavor changing neutral currents

Author: MaLongGang
Tutor: LiZuoHong
School: Yantai University
Course: Particle Physics and Nuclear Physics
Keywords: SM Z’ model FCNC B boson two-body decay
CLC: O572.33
Type: Master's thesis
Year: 2011
Downloads: 8
Quote: 0
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Abstract


The standard model of particle physics is to describe the electroweak interaction and strong interaction of the theoretical model.The SM in the past few decades have been fully verified ,but the standard model is not perfect .Some problems in the SM up to now have not been solved . There are some differences between theoretical predictions and experimental results. This show that the SM is not a final theory and it should be under a certain energy scale. There should be a more fundamental theory at a higher level under the energy scale.B physics not only reveal the close strong interaction physics but also is a good place in which we can study the accuracy of CP , rare decays and flavor change process ,but also though the research of the heavy flavor physics beyond the standard model we can find new indirect evidence of physical presence .In the SM , there is no tree-level FCNC .Although there under the lap-level FCNC but down the GIM mechanism, the coupling is extremely small and difficult to detect in the experiment .up to now the top quark is the heaviest particle .In some new physical model ,the coupling involving the top quark FCNC generally have been improved.In an extension of the SM, the particle physics field show that the neutral z’is the existence of bosons. The corresponding U（1）’group is the expansion of the standard model U（1） . while the coupling matrix between gauge bosons z’and the SM fermions is not proportional to the diagonal matrix, the half decay ofτwill produce FCNC . In theory, the new pair lepton flavor breaking process has been extensive researched. The result show that the decay branching ratio is up to O( 10-8 )～O( 10-6 ) ,which has been detected in the high energy experiment . So beyond the standard model the lepton flavor breaking decay experiment is sensitive.

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CLC: > Mathematical sciences and chemical > Physics > Nuclear physics,high energy physics > High-energy physics > Particle types > Meson
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