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The Study of the pp→∏_t~+∏_t~-, ∏_t~0∏_t~0, h_t~0∏_t~0 Processes at the LHC in the TC2 Model

Author: ZhaoZuo
Tutor: XuWenNa
School: Henan Normal
Course: Theoretical Physics
Keywords: Standard model Electroweak symmetry breaking TC2 model top-pion top-higgs
CLC: O572.33
Type: Master's thesis
Year: 2011
Downloads: 12
Quote: 0
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Abstract


As low-energy effective theory, the standard model is a very successful model. It is also the particle physics community over the past nearly four decades, the most successful and also the most mature theory, more than three decades of experimental data on the collider so that it was a very strong support. Nevertheless, the standard model or a series of problems. One very critical part is the electroweak symmetry breaking mechanism is still not clear, it is difficult to explain the origin of particle mass; addition the introduction of the Higgs field, the theory unnatural (or specification level) and mediocrity such as a series of questions. These problems left over from making the speculation that there may be the existence of new physics beyond standard model, because if there is no introduction of new physical with this legacy and it is impossible to compare the self-consistent explanation. So the particle physics community spent a lot of time and effort in this meaningful exploration, made a lot of new physics beyond the standard model outside the model (for example: the dynamics of electroweak symmetry breaking missing model, supersymmetric models) to look forward to be able to solve the problems of the standard model. For these new physical model has also launched a large number of phenomenological research work, in order to provide an effective means to test these new physical model. Among these new physical model, artificial color (TC) model is also more promising one of the candidates, it is A Dynamics electroweak symmetry breaking theory, and in the past 30 years has been fully developed. In the 1990s, topcolor is introduced into this model among TC theory, so we called topcolor assisted technicolor model (TC2 model). It not only gives the electroweak symmetry breaking dynamics mechanism, but also to explain the problems of the large mass of the top quark is an ideal model of TC article is phenomenological research work in the framework of TC2 model . TC2 model predicts that the number of new particles, its most basic predictions in a few hundred GeV energy region there are three Pseudo-goldstone boson, known as top-pion meson (Π_t to ± Π_t ~~ 0), addition there is a scalar particle top-higgs (ht 0). Top-pion and top-higgs is regarded as a the TC2 model the characteristics of particles. Therefore detect signs of these particles may exist in high energy collider is a better way to verify the TC2 model. This paper first introduces the basic idea of ??the TC theory and its development process, then TC2 model study the LHC on collider Π_t ~~ Π_t ~ -, Π_t ~ 0Π_t ~~ 0 ht 0Π_t to 0 generated by the process, calculation results show that the , Π_t to Π_t ~ - production cross section of the process, we selected parameter space can reach up to the production cross section of 30pb Π_t from ~ 0Π_t to 0 process 340fb, Π_t ~ 0 h_t ~ 0 process can achieve production cross section 250fb. LHC annual integrated luminosity of colliders may reach 100fb-1, then these processes produced annually by the examples take into account the number is considerable, which is very favorable opportunities in the LHC collider directly looking the TC2 model characteristics particles. Free parameters (ε, mΠt, mht) looking at the impact of these processes, the production cross section at the LHC prefer lower quality top-pions and top-Higgs. From the production cross section, the a light the TC2 characteristics particles produce cross-sectional greater, which produce the number of cases more, and have more clean generation signal to facilitate observation. By theory Hadron Collider LHC research the pp → Π_t to Π_t -, Π_t to 0Π_t ~ 0, h_t ~ 0Π_t 0 process, you can test the correctness of TC2 model valuable information.

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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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