This thesis describes the search for the associated production of a Higgs boson with top anti-top pairs in proton anti-proton collisions at a centre-of-mass energy of 1.96 TeV.The data used were collected by the D0 detector during the RunII data taking period which ran from 2001 to 2011 at the Tevatron Collider located at the Fermi National Accelerator Laboratory (or Fermilab).Distributions of the H_T variable separated into 3 jet, 4 b-tagging and 2 lepton categories were used as inputs to a modified frequentist limit setting procedure, which was in turn used to search for the ttH process with Higgs decaying to b anti-b pairs. Since this process was not observed, limits were set on the cross section times branching ratio, with an expected (observed) limit of 36.8 (65.8) measured for a Higgs mass value of 125 GeV.
|Date of Award
|1 Aug 2014
- The University of Manchester
|Terence Wyatt (Supervisor) & Christian Schwanenberger (Supervisor)