Search for the Standard Model Higgs Boson at DØ in the Final State with Two τ's and Two Jets

Thesis/Dissertation · Mon Aug 01 04:00:00 EDT 2011

DOI:https://doi.org/10.2172/1024913· OSTI ID:1024913

Tschann-Grimm, Kathryn ^[1]

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1. Stony Brook Univ., NY (United States)

The Standard Model (SM) is a very successful description of particle physics, and its predictions have stood up to a multitude of precision experimental tests. But one of the central elements of the SM, the Higgs mechanism, has yet to be verified. The Higgs mechanism (and the associated Higgs Boson) generates electroweak symmetry breaking and consequently allows for W and Z bosons and fermions to be massive. This thesis presents a search for the SM Higgs boson at the D0 experiment using the Tevatron particle accelerator at Fermilab in the final state ττ + jet jet with 4.3 fb^-1 of data. This final state is sensitive to the Higgs production mechanisms gluon-gluon fusion and vector-boson fusion, and to the Higgs produced in association with a W or Z, for Higgs masses from 100 to 200 GeV. We see no evidence for the Higgs boson, but by itself our search does not rule out the SM Higgs. When this analysis is combined with other searches at the Tevatron the Higgs can be ruled out at a 95% confidence level for the mass range from 156 to 177 GeV.

• Research Organization: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 1024913
• Report Number(s): FERMILAB-THESIS--2011-27
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCELERATORS
ACCURACY
BOSONS
Experiment-HEP
FERMILAB
FERMILAB TEVATRON
FERMIONS
HIGGS BOSONS
PHYSICS
PRODUCTION
STANDARD MODEL
SYMMETRY BREAKING