Searches for tt and tb resonances at CMS

25 Aug 2015, 15:30
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Emanuele Usai (Hamburg University (DE))


We present searches for resonant production of top quark pairs or top- and b quarks, using proton-proton collision data collected with the CMS detector at the CERN LHC at a center-of-mass energy of 8 TeV. The search is performed by measuring the invariant mass distribution of the quark pair and testing for deviations from the expected Standard Model background. Final states with zero, one or two leptons are considered and the selection is optimized accordingly, taking into account the high Lorentz boost of the top quarks at high invariant masses. These boosted top quark signatures can be identified and reconstructed through the use of jet substructure and subjet b-tagging algorithms. The results are presented in the form of mass and cross section limits on three types of new physics models: both a narrow and wide Z' boson as well as an Randall-Sundrum Kaluza-Klein gluon or a heavy W' gauge boson.

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