%0 Thesis
%A Tholen, Heiner
%T Search for single production of a heavy vector-like T quark decaying to a top quark and a Higgs boson with the CMS Experiment
%N DESY-THESIS-2017-028
%I Universität Hamburg
%V Dr.
%C Hamburg
%M PUBDB-2017-07592
%M DESY-THESIS-2017-028
%B DESY-THESIS
%P 171
%D 2017
%Z Universität Hamburg, Diss., 2017
%X The presented work is a search for single production of vector-like T quarks.Vector-like quarks are common among non-SUSY theories that strive to solve the hierarchy problem.The search is undertaken with 2.3 fb of proton-proton collisions at a centre of mass energy of √s=13 TeV, recorded with the CMS experiment at the CERN LHC in 2015.The T quark decay channel into a top quark and a Higgs boson is considered.A mass-range from 700 GeV up to 1800 GeV is scanned, where the top quark and Higgs boson acquire a significant Lorentz boost.An electron or muon in the final state is required, as well as a collimated pair of b quarks from the decay of the boosted Higgs boson.The search is performed as a shape analysis with a signal plus background model, fitted to the data.The shape of the background is extracted from a signal-depleted control region in the data.The background shape describes the observed data well and no excess of events is seen.Exclusion limits are derived for the single T quark production cross section times the branching fraction of the T quark decay into a Higgs boson and a top quark.A Bayesian statistical method is applied.At 95% confidence level, values of 0.49 pb and 0.18 pb (0.42 pb and 0.14 pb) for T quark masses of 1200 GeV and 1700 GeV, respectively, are excluded for T quark production in association with b (top) quarks.These are the first results on singly produced vector-like quarks published by the CMS Collaboration and the first results from the LHC at √s=13 TeV.
%F PUB:(DE-HGF)3 ; PUB:(DE-HGF)29 ; PUB:(DE-HGF)11
%9 BookReportDissertation / PhD Thesis
%R 10.3204/PUBDB-2017-07592
%U https://bib-pubdb1.desy.de/record/331169