Search for the Standard Model Higgs Boson in Missing Transverse Energy and $$b$$-quark Final States Using Proton-Antiproton Collisions at 1.96 TeV

Thesis/Dissertation · Sat Jan 01 04:00:00 EST 2011

DOI:https://doi.org/10.2172/1015389· OSTI ID:1015389

Dorland, Tyler McMillan ^[1]

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1. Univ. of Washington, Seattle, WA (United States)

A search for the standard model Higgs boson is performed in 6.4 fb^-1 of p$$\bar{p}$$ collisions at √s = 1.96 TeV, collected with the DØ detector during Run II of the Fermilab Tevatron. The final state considered is a pair of jets originating from b quarks and missing transverse energy, as expected from p$$\bar{p}$$ → ZH → v$$\bar{v}$$b$$\bar{b}$$ production. The search is also sensitive to the WH → ℓvb$$\bar{b}$$ channel, where the charged lepton is not identified. Boosted decision trees are used to discriminate signal from background. Good agreement is observed between data and expected backgrounds, and a limit is set at 95% C.L. on the section multiplied by branching fraction of (p$$\bar{p}$$ → (Z/W)H) x (H → b$$\bar{b}$$). For a Higgs boson mass of 115 GeV, the observed limit is a factor of 3.5 larger than the value expected from the standard model.

• Research Organization: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 1015389
• Report Number(s): FERMILAB-THESIS--2011-10
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
B QUARKS
Experiment-HEP
FERMILAB TEVATRON
HIGGS BOSONS
LEPTONS
PRODUCTION
STANDARD MODEL
TRANSVERSE ENERGY
TREES