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Search For Heavy, Neutral Gague Bosons Decaying To Boosted Top Quark Pairs At The LHC


One of the important early searches at the Large Hadron Collider at CERN is for high mass Z-like objects. Such objects are predicted in a number of extensions to the Standard Model and the analyses may become sensitive to their decays at fairly modest integrated luminosities. This thesis decribes a search for a neutral, heavy gague boson decaying into boosted top quark pairs using the first 5.0 fb-1 of sqrt(s) = 7 TeV data from the 2011 physics run of the LHC. By exploiting the semi-muonic decays of the top pairs and using boosted decision trees to perform the final event selection we set upper limits on the cross section of a heavy, Z-like gague boson of 5 pb at the lowest masses (500 GeV) to less than 1 pb for masses above 1 TeV.

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