Top Quark Mass Measurement in the Lepton plus Jets Channel Using a Modified Matrix Element Method

Abstract

We report a measurement of the top quark mass, m_t, obtained from ppbar collisions at sqrt(s) = 1.96 TeV at the Fermilab Tevatron using the CDF II detector. We analyze a sample corresponding to an integrated luminosity of 1.9 fb^-1. We select events with an electron or muon, large missing transverse energy, and exactly four high-energy jets in the central region of the detector, at least one of which is tagged as coming from a b quark. We calculate a signal likelihood using a matrix element integration method, with effective propagators to take into account assumptions on event kinematics. Our event likelihood is a function of m_t and a parameter JES that determines /in situ/ the calibration of the jet energies. We use a neural network discriminant to distinguish signal from background events. We also apply a cut on the peak value of each event likelihood curve to reduce the contribution of background and badly reconstructed events. Using the 318 events that pass all selection criteria, we find m_t = 172.7 +/- 1.8 (stat. + JES) +/- 1.2 (syst.) GeV/c^2.

46 pages, 16 figures. Edited in response to referee comments and resubmitted to Phys. Rev. D

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• Reducing combinatorial uncertainties: A new technique based on MT2 variables
• The stransverse mass, MT2, in special cases
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• Search for New Color-Octet Vector Particle Decaying to ttbar in ppbar Collisions at $\sqrt{s}=1.96$ TeV
• Review of Properties of the Top Quark from Measurements at the Tevatron
• A Phenomenological Study of Bottom Quark Fragmentation in Top Quark Decay
• Precision measurements of the top quark mass from the Tevatron in the pre-LHC era
• Searching for Top Squarks at the LHC in Fully Hadronic Final State
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• Searches for the Higgs boson decaying to W^{+} W^{-} -> l^{+}nu l^{-}nubar with the CDF II detector
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