Direct Top-Quark Width Measurement at CDF
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Aaltonen-2010-Direct Top-Quark Wid.pdf
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Author(s)
Gomez-Ceballos, Guillelmo
Goncharov, Maxim
Makhoul, Khaldoun
Paus, Christoph M. E.
Bauer, Gerry P
Date Issued
December 2010
Journal
Physical review letters
Publisher
American Physical Society
Citation
Aaltonen, T. et al. “Direct Top-Quark Width Measurement at CDF.” Physical Review Letters 105.23 (2010) : n. pag. © 2010 The American Physical Society
Version
Final published version
Abstract
We present a measurement of the top-quark width in the lepton+jets decay channel of tt̅ events produced in pp̅ collisions at Fermilab’s Tevatron collider and collected by the CDF II detector. From a data sample corresponding to 4.3 fb-1 [fb superscript -1] of integrated luminosity, we identify 756 candidate events. The top-quark mass and the mass of the hadronically decaying W boson that comes from the top-quark decay are reconstructed for each event and compared with templates of different top-quark widths (Γt) [gamma subscript t] and deviations from nominal jet energy scale (ΔJES)[delta subscript JES] to perform a simultaneous fit for both parameters, where ΔJES [delta subscript JES] is used for the in situ calibration of the jet energy scale. By applying a Feldman-Cousins approach, we establish an upper limit at 95% confidence level (CL) of Γt<7.6 GeV [gamma subscript t<7.6 GeV] and a two-sided 68% CL interval of 0.3 GeV<Γt<4.4 GeV [GeV
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.105.232003
