Search for the Standard Model Higgs boson in the missing energy topology with DØ

Thesis/Dissertation · Mon Jun 01 04:00:00 EDT 2009

DOI:https://doi.org/10.2172/966187· OSTI ID:966187

Christoudias, Theodoros ^[1]

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1. Imperial College, London (United Kingdom)

A search for the Standard Model Higgs boson in the missing energy and acoplanar b-jet topology is reported, using an integrated luminosity of 0.93 fb^-1 recorded by the D0 detector at the Fermilab Tevatron p$$\bar{p}$$ Collider. The analysis includes signal contributions from p$$\bar{p}$$ → ZH → v$$\bar{v}$$b$$\bar{b}$$, as well as from WH production in which the charged lepton from the W boson decay is undetected. Neural networks are used to separate signal from background. In the absence of a signal, limits are set on σ(p$$\bar{p}$$ → VH) x B(H → b$$\bar{b}$$) at the 95% C.L. of 2.6-2.3 pb, for Higgs boson masses in the range 105-135 GeV, where V = W, Z. The corresponding expected limits range from 2.8 to 2.0 pb. Potential improvements to the analysis with an extended dataset totalling 4 fb^-1 are also discussed. Essential maintenance related to the increased luminosity and RunIIb upgrade was carried out on the impact parameter (IP) based b-tagging trigger tool and the effect of the changes on the b-tagger's performance was investigated.

• Research Organization: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 966187
• Report Number(s): FERMILAB-THESIS--2009-32
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
DECAY
Experiment-HEP
FERMILAB TEVATRON
HIGGS BOSONS
IMPACT PARAMETER
INTERMEDIATE BOSONS
LEPTONS
LUMINOSITY
MAINTENANCE
NEURAL NETWORKS
PERFORMANCE
PRODUCTION
STANDARD MODEL
TOPOLOGY