A Measurement of the Mass of the Top Quark in Lepton + Jets Events at CDF

Thesis/Dissertation · Thu Jan 01 04:00:00 EST 2004

DOI:https://doi.org/10.2172/15017205· OSTI ID:15017205

Brubaker, Erik Matthews ^[1]

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1. Univ. of California, Berkeley, CA (United States)

This document presents a measurement of the top quark mass using the CDF run II detector at Fermilab. Colliding beams of protons and anti-protons at Fermilab's Tevatron (√s = 1.96 TeV) produce top/anti-top pairs, which decay to W⁺W^- b$$\bar{b}$$; events are selected where one W decays hadronically, and one W decays to either e or μ plus a neutrino. The data sample was collected between March 2002 and September 2003, and corresponds to an integrated luminosity of approximately 162 pb^-1. Thirty-seven candidate t$$\bar{t}$$ events are found with at least one b jet identified by its displaced vertex. In each event, the best fit top quark invariant mass is determined by minimizing a Χ² for the overconstrained kinematic system. A likelihood fit of the reconstructed masses in the data sample to distributions from simulated signal and background events gives a top mass of 174.9$$+7.1\atop{-7.7}$$(stat.) ± 6.5(syst.) GeV/c². The dominant systematic error is due to uncertainties in the jet energy measurements.

• Research Organization: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-76CH03000
• OSTI ID: 15017205
• Report Number(s): FERMILAB-THESIS--2004-55
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
COLLIDING BEAMS
DECAY
Experiment-HEP
FERMILAB
FERMILAB COLLIDER DETECTOR
FERMILAB TEVATRON
LEPTONS
LUMINOSITY
PROTONS
T QUARKS