研究生: |
劉嘯青 Siao-Cing Liou |
---|---|
論文名稱: |
在強子對撞機產生 Z' 的探討 On the Extra Z Boson Production at Hadron Colliders |
指導教授: |
張維甫
We-Fu Chang |
口試委員: | |
學位類別: |
碩士 Master |
系所名稱: |
理學院 - 物理學系 Department of Physics |
論文出版年: | 2007 |
畢業學年度: | 95 |
語文別: | 英文 |
論文頁數: | 41 |
中文關鍵詞: | 大強子對撞機 、弱交互作用 、標準模型 、超越標準模型 |
外文關鍵詞: | Extra Z boson, Drell-Yan, LHC, parton distribution function, gluon fusion, associated production, weak interaction, the Standard Model, beyond the Standard Model |
相關次數: | 點閱:5 下載:0 |
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許多超越標準模型的理論都包含了一個叫做Z'的中性規範玻色子。在即將完成的擁有14TeV質心能量的大強子對撞機中探測這個新的規範粒子會很有趣。我們討論了幾個主要在大強子對撞機中生成Z'的過程:Drell-Yan 過程、膠子融合、費米子對關聯生成。我們用了一個與模型無關的方法來計算出Z'的散射截面。而我們算出標準模型Z的生成率來檢查我們的散射截面,其結果與已知符合。而根據Yang's theorem,一個圈圖的膠子融合生成是不會發生的。我們直接計算一個圈圖來看Yang's theorem 如何讓圈圖的機率幅為零。我們還得到關聯生成的振幅決對值平方的解析解。
Many theories beyond the Standard Model contain extra neutral gauge boson(s), called Z' [1]. It will be interesting to probe this new gauge particle at the coming Large Hadron Collider ( LHC ) which has a 14 TeV CM energy. We discuss a few leading production processes of Z' at LHC: the Drell-Yan process, the gluon fusion, and the fermion pair associated production. The Z' production cross section is calculated in a model-independent way. As a check, the production rate of the Standard Model Z is found to agree with the known result. The one loop gluon fusion production is forbidden by Yang's theorem [2]. We explicitly carry out a loop calculation and see how this theorem works. We also obtain the analytic form of amplitude square for associated production.
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