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Precise measurement of the top-quark mass in the lepton+jets topology at CDF II
Authors:Aaltonen T  Abulencia A  Adelman J  Affolder T  Akimoto T  Albrow M G  Amerio S  Amidei D  Anastassov A  Anikeev K  Annovi A  Antos J  Aoki M  Apollinari G  Arisawa T  Artikov A  Ashmanskas W  Attal A  Aurisano A  Azfar F  Azzi-Bacchetta P  Azzurri P  Bacchetta N  Badgett W  Barbaro-Galtieri A  Barnes V E  Barnett B A  Baroiant S  Bartsch V  Bauer G  Beauchemin P-H  Bedeschi F  Behari S  Bellettini G  Bellinger J  Belloni A  Benjamin D  Beretvas A  Beringer J  Berry T  Bhatti A  Binkley M  Bisello D  Bizjak I  Blair R E  Blocker C  Blumenfeld B  Bocci A  Bodek A  Boisvert V  Bolla G  Bolshov A  Bortoletto D  Boudreau J  Boveia A  Brau B
Institution:Division of High Energy Physics, Department of Physics, University of Helsinki and Helsinki Institute of Physics, FIN-00014, Helsinki, Finland.
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(+)bW(-)b-->lnubqq'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 955 pb(-1) of integrated luminosity, we achieve the single most precise measurement of the top-quark mass, 170.8+/-2.2(stat.)+/-1.4(syst.) GeV/c(2).
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