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Title: Search for the associate production of Higgs bosons with top anti-top pairs

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 theHT variable separated into 3 jet, 5 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 t$$\bar{t}$$H process with H→b$$\bar{b}$$. Since this process was not observed, limits were set on the cross section times branching ratio σ(t$$\bar{t}$$H) BR(H → b$$\bar{b}$$) , with an expected (observed) limit of 24.7 (74.3) measured for a Higgs mass value of 125 GeV.
Authors:
 [1]
  1. Univ. of Manchester (United Kingdom)
Publication Date:
OSTI Identifier:
1155868
Report Number(s):
FERMILAB-THESIS--2014-09
DOE Contract Number:
AC02-07CH11359
Resource Type:
Thesis/Dissertation
Research Org:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS