Precision Top-Quark Mass Measurement in the Lepton+Jets Topology in pp̅ Collisions at √s =1.96 TeV

Authors

A. Abulencia, University of Illinois, Urbana
Kenneth A. Bloom, University of Nebraska-LincolnFollow
CDF Collaboration

Date of this Version

1-20-2006

Comments

Published by American Physical Society. Phys. Rev. Lett. 96, 022004 (2006). http://prl.aps.org. Copyright © 2006 American Physical Society. Permission to use.

Abstract

We report two measurements of the top-quark mass M_top using the CDF II detector at the Fermilab Tevatron in a 318 pb^-1 data sample of tt̅ events in the lepton + jets final state. One method uses an event-based likelihood technique resulting inM_top = 173.2_-2.4^+2.6(stat) ± 3.2(syst) GeV/c² or 173.2_-4.0^+4.1GeV/c². The second method reconstructs a top-quark mass in each event using the measured invariant mass of the hadronically decaying W boson to constrain the jet energy scale to obtain a value forM_top of 173.5_-3.6^+3.7(stat) ± 1.3(syst) GeV/c² or 173.5_-3.8^+3.9GeV/c². We take the latter, which is more precise, as our result.