Search for standard model Higgs bosons decaying to w-boson pairs in proton-anti-proton collisions at √s= 1.96 TeV
This thesis describes a search for standard model Higgs bosons decaying to W boson pairs in proton-anti-proton collisions at a center of mass energy of 1.96 TeV using the CDF II detector. The decay to W bosons is dominant for Higgs masses greater than about 135 GeV. The final state examined consists of two leptons and missing transverse energy from the leptonic decay of one or more W bosons. The signal production mechanisms included are gluon fusion, associated production with a W or Z boson, and vector boson fusion. Matrix element calculations and artificial neural networks are used to discriminate signal from background for Higgs masses in the range 110 ≤M H ≤ 200 GeV. No significant excess of events is observed at any of the Higgs masses investigated. Upper limits on the standard model Higgs cross section are set at 95% confidence for each Higgs mass investigated, the most stringent limit being 1.63 times the predicted standard model cross section for a Higgs mass of 160 GeV.
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- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
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- United States
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; A CENTERS; BOSONS; CROSS SECTIONS; DECAY; FERMILAB COLLIDER DETECTOR; GLUONS; HIGGS BOSONS; INTERMEDIATE BOSONS; LEPTONIC DECAY; LEPTONS; MATRIX ELEMENTS; NEURAL NETWORKS; STANDARD MODEL; TRANSVERSE ENERGY; VECTORS; Experiment-HEP
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