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Measurement of the top-quark mass in all-hadronic decays in pp collisions at CDF II
Authors:Aaltonen T  Abulencia A  Adelman J  Affolder T  Akimoto T  Albrow M G  Ambrose D  Amerio S  Amidei D  Anastassov A  Anikeev K  Annovi A  Antos J  Aoki M  Apollinari G  Arguin J-F  Arisawa T  Artikov A  Ashmanskas W  Attal 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  Bedeschi F  Behari S  Belforte S  Bellettini G  Bellinger J  Belloni A  Benjamin D  Beretvas A  Beringer J  Berry T  Bhatti A  Binkley M  Bisello D  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
Affiliation: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 top-quark mass Mtop in the all-hadronic decay channel tt-->W+bW-b-->q1q2bq3q4b. The analysis is performed using 310 pb-1 of sqrt[s]=1.96 TeV pp[over ] collisions collected with the CDF II detector using a multijet trigger. The mass measurement is based on an event-by-event likelihood which depends on both the sample purity and the value of the top-quark mass, using 90 possible jet-to-parton assignments in the six-jet final state. The joint likelihood of 290 selected events yields a value of Mtop=177.1+/-4.9(stat)+/-4.7(syst) GeV/c2.
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