Measurement of the Top Quark Mass with the Dynamical Likelihood Method using Lepton plus Jets Events with b-tags in ppbar Collisions at s**(1/2) = 1.96 TeV

Abstract

This report describes a measurement of the top quark mass, M_{top}, with the dynamical likelihood method (DLM) using the CDF II detector at the Fermilab Tevatron. The Tevatron produces top/anti-top pairs in protons and anti-protons collisions at a center-of-mass energy of 1.96 TeV. The data sample used in this analysis was accumulated from March 2002 through August 2004, which corresponds to an integrated luminosity of 318 pb^{-1}. We use the top/anti-top candidates in the ``lepton+jets'' decay channel, requiring at least one jet identified as a b quark by finding a displaced secondary vertex. The DLM defines a likelihood for each event based on the differential cross section as a function of M_{top} per unit phase space volume of the final partons, multiplied by the transfer functions from jet to parton energies. The method takes into account all possible jet combinations in an event, and the likelihood is multiplied event by event to derive the top quark mass by the maximum likelihood method. Using 63 top quark candidates observed in the data, with 9.2 events expected from background, we measure the top quark mass to be 173.2 +2.6/-2.4 (stat.) +/- 3.2 (syst.) GeV/c^2, or 173.2 +4.1/-4.0 GeV/c^2.

arXiv comment66 pages, 26 figures, 4 tables

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• Precise measurement of the top quark mass in the lepton+jets topology at CDF II
• Maximum Significance at the LHC and Higgs Decays to Muons
• Measurement of the p anti-p to t anti-t Production Cross Section and the Top Quark Mass at sqrt{s}=1.96 TeV in the All-Hadronic Decay Mode
• Status and Prospects of Top-Quark Physics
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• Top Quark Mass Measurement in the Lepton plus Jets Channel Using a Modified Matrix Element Method
• 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
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