Search for a Standard Model Higgs boson in CMS via vector boson fusion in the $$H \to W W \to$$ lepton neutrino lepton neutrino channel and optimization of energy reconstruction in CMS using test beam 2006 data
- Middle East Technical Univ., Ankara (Turkey)
One of the goals of the LHC is to test the existence of the Higgs boson. This thesis presents a study of the potential to discover the Standard Model Higgs boson in the vector boson fusion (VBF) channel for the Higgs mass range 120- 200 GeV/c2. The decay of Higgs bosons into the WW* fi state with both W-bosons decaying leptonically is considered. The main backgrounds are tt + j and W +W -jj. This study, based on a full simulation of the CMS detector at the LHC, shows that a 5σ discovery can be done with an integrated luminosity of 12 - 72 fb-1 for 130 - 200 GeV/c2 Higgs bosons. Due to the uncertainties in the backgrounds, it is important to measure the backgrounds from data. This study shows that the major background can be measured directly to 7% with 30 fb-1. After discovering the Higgs boson, it will be crucial to probe its physical properties. A method to measure the Higgs boson mass using transverse mass template distributions is investigated in the VBF channel. iv The performance of the combined CMS electromagnetic and hadronic calorimeters (EB+HB) was measured at the H2 test beam at the CERN SPS during 2006 with various particles in a large momentum range, 1-350 GeV/c. Another major contribution of this thesis is developing the method to optimize the energy reconstruction for the combined EB+HB system with which the corrected responses become 100% with 6% fl and the stochastic resolution is improved from 111% to 94%.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1415819
- Report Number(s):
- FERMILAB-THESIS-2007-13; CERN-THESIS-2007-052; 756034
- Country of Publication:
- United States
- Language:
- English
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