Search for a Vector-like Quark with Charge 2=3 in t + Z Events from pp Collisions at sqrt(s) = 7 TeV
博士 === 國立臺灣大學 === 物理研究所 === 100 === We present a search for pair-produced vector-like charge 2/3 quarks, T, in pp collisions at a center-of-mass energy of 7 TeV performed by the CMS experiment at the LHC. Events consistent with the flavor changing neutral current decay of a T quark to a top quark an...
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| Format: | Others |
| Language: | en_US |
| Published: |
2012
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| Online Access: | http://ndltd.ncl.edu.tw/handle/61573727681319251473 |
| Summary: | 博士 === 國立臺灣大學 === 物理研究所 === 100 === We present a search for pair-produced vector-like charge 2/3 quarks, T, in pp collisions at a center-of-mass energy of 7 TeV performed by the CMS experiment at the LHC. Events consistent with the flavor changing neutral current decay of a T quark to a top quark and a Z boson are selected by requiring two leptons from the Z decay as well as an additional isolated, charged lepton. With an integrated luminosity of 1.14 /fb, the observed events are found to be consistent with the standard model background prediction. Assuming a branching fraction of 100% for the decay T -> tZ, a T quark with mass less than 475 GeV/c2 is excluded at a 95% confidence level.
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