Search for the Standard Model Higgs Boson in ZH → v$$\bar{v}$$b$$\bar{b}$$ channel in p$$\bar{p}$$ collisions at √s= 1.96 TeV

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

DOI:https://doi.org/10.2172/1128099· OSTI ID:1128099

Dubey, Abhinav ^[1]

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1. Univ. of Delhi, New Delhi (India)

A search for the standard model Higgs boson is performed in 5.2 fb^-1 of p$$\bar{p}$$ collisions at p √s = 1.96 TeV, collected with the DØ detector at the Fermilab Tevatron. The final state considered is a pair of b jets with large 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, for a Higgs-boson mass of 115 GeV, a limit is set at 95% C.L. on the cross section multiplied by branching fraction of (p$$\bar{p}$$ → (Z/W)H) × (H → b$$\bar{b}$$) that is a factor 4.57 expected and 3.73 observed 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), High Energy Physics (HEP) (SC-25)
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 1128099
• Report Number(s): FERMILAB-THESIS--2011-62
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS