Direct Measurement of the Total Decay Width of the Top Quark
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Aaltonen-2013-Direct measurement of.pdf
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Author(s)
Gomez-Ceballos, Guillelmo
Goncharov, Maxim
Paus, Christoph M. E.
Date Issued
November 2013
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Aaltonen, T., S. Amerio, D. Amidei, A. Anastassov, A. Annovi, J. Antos, G. Apollinari, et al. “Direct Measurement of the Total Decay Width of the Top Quark.” Physical Review Letters 111, no. 20 (November 2013). © 2013 American Physical Society
Version
Final published version
Abstract
We present a measurement of the total decay width of the top quark using events with top-antitop quark pair candidates reconstructed in the final state with one charged lepton and four or more hadronic jets. We use the full Tevatron run II data set of √s = 1.96 TeV proton-antiproton collisions recorded by the CDF II detector. The top quark mass and the mass of the hadronically decaying W boson are reconstructed for each event and compared with distributions derived from simulated signal and background samples to extract the top quark width (Γ[subscript top]) and the energy scale of the calorimeter jets with in situ calibration. For a top quark mass M[subscript top] = 172.5 GeV/c[superscript 2], we find 1.10 < Γ[subscript top] < 4.05 GeV at 68% confidence level, which is in agreement with the standard model expectation of 1.3 GeV and is the most precise direct measurement of the top quark width to date.
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.111.202001
