Precise Measurement of the Top-Quark Mass in the Lepton+Jets Topology at CDF II

T. Aaltonen et al. (CDF Collaboration)
Phys. Rev. Lett. 99, 182002 – Published 31 October 2007

Abstract

We present a measurement of the mass of the top quark from proton-antiproton collisions recorded at the CDF experiment in Run II of the Fermilab Tevatron. We analyze events from the single lepton plus jets final state (tt¯W+bWb¯lνbqq¯b¯). The top-quark mass is extracted using a direct calculation of the probability density that each event corresponds to the tt¯ final state. The probability is a function of both the mass of the top quark and the energy scale of the calorimeter jets, which is constrained in situ by the hadronic W boson mass. Using 167 events observed in 955pb1 of integrated luminosity, we achieve the single most precise measurement of the top-quark mass, 170.8±2.2(stat.)±1.4(syst.)GeV/c2.

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  • Received 29 March 2007

DOI:https://doi.org/10.1103/PhysRevLett.99.182002

©2007 American Physical Society

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Vol. 99, Iss. 18 — 2 November 2007

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