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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/52947
標題: | 利用噴流結構於8TeV質心能量尋找矢量T(2/3)夸克 Search for Vector-like T(2/3) Quarks with Jet Substructure at 8 TeV |
作者: | Charles Hermann Dietz 諸葛明 |
指導教授: | 陳凱風(Kai-Feng Chen) |
關鍵字: | CMS,矢量T夸克,噴流結構,8 TeV, CMS,Vector-like Quarks,Top Partner,Jet Subtructure,8 TeV, |
出版年 : | 2015 |
學位: | 博士 |
摘要: | This thesis presents the search for pair-produced vector-like top quark partners of charge 2/3e in 19.7fb^-1 of proton-proton collisions at S^(1/2) = 8 TeV collected with the CMS detector in 2012 at the Large Hadron Collider. This search is optimized for the decay mode T to bW in the fully hadronic final state. Due to the large mass of the T quark, its decay products are significantly boosted, requiring the use of specialized jet substructure techniques. Selected events must have four jets, of which two are assigned to the hadronic W boson decay and the other one or two are consistent with the hadronization of a b quark. No excess of events above the expected standard model backgrounds is observed and limits are set on the T pair-production cross section. T quarks with masses below 705 GeV/c^2 are excluded at the 95% confidence level. Sensitivity measurement on the T to tZ and T to tH decays is also performed. The result of the statistical combination with similar searches performed at CMS is also presented as it provides the strongest limits on vector-like T quarks. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/52947 |
全文授權: | 有償授權 |
顯示於系所單位: | 物理學系 |
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