Measurements of the Top Quark Pair Production Cross Section in Lepton + Jets Final States using a Topological Multivariate Technique as well as Lifetime b-Tagging in Proton-Anti-proton Collisions at √s =1.96 TeV with the DØ Detector at the Tevatron

Thesis/Dissertation · Sat Jan 01 00:00:00 EST 2005

DOI:https://doi.org/10.2172/15017289· OSTI ID:15017289

Golling, Tobias F. ^[1]

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1. Univ. of Bonn (Germany)

Two alternative measurements of the t¯t production cross section at √s = 1.96 TeV in proton-antiproton collisions in the lepton+jets channel are presented. The t¯t production cross section is extracted by combining the kinematic event information in a multivariate discriminant. The measurement yields σ_{p¯p → t¯t + x} = 5.13_-1.57^+1.76(stat)_-1.10^+0.96(syst) ± 0.33 (lumi) pb in the muon+jets channel, using 229.1 pb^-1, and in the combination with the electron+jets channel (226.3 pb^-1) σ_{p¯p → t¯t + x} = 6.60_-1.28^+1.37(stat)_-1.11^+1.25(syst) ± 0.43 (lumi) pb. The second measurement presented reconstructs explicitly secondary vertices to d lifetime b-tagging. The measurement combines the muon+jets and the electron+jets channel, using 158.4 pb^-1 and 168.8 pb^-1, respectively: σ_{p¯p → t¯t + x} = 8.24_-1.25^+1.34(stat)_-1.63^+1.89(syst) ± 0.54 (lumi) pb.

• Research Organization: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-76CH03000
• OSTI ID: 15017289
• Report Number(s): FERMILAB-THESIS-2005-01; TRN: US0605181
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CROSS SECTIONS
FERMILAB TEVATRON
LEPTONS
LIFETIME
PAIR PRODUCTION
PRODUCTION
PROTONS
T QUARKS
Experiment-HEP