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Direct top-quark width measurement at CDF.

T Aaltonen1, B Álvarez González, S Amerio

  • 1Division of High Energy Physics, Department of Physics, University of Helsinki and Helsinki Institute of Physics, FIN-00014, Helsinki, Finland.

Physical Review Letters
|January 15, 2011
PubMed
Summary
This summary is machine-generated.

Researchers measured the top-quark width using data from proton-antiproton collisions at the Tevatron. The study found the top-quark width to be consistent with the Standard Model prediction, setting an upper limit of 7.6 GeV.

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Area of Science:

  • Particle Physics
  • High-Energy Physics
  • Collider Physics

Background:

  • The top-quark is the heaviest known elementary particle.
  • Understanding its properties, such as its width, is crucial for testing the Standard Model.
  • Previous measurements have provided constraints on the top-quark width.

Purpose of the Study:

  • To measure the top-quark width (Γ(t)) using the lepton+jets decay channel.
  • To provide a precise determination of Γ(t) and compare it with Standard Model predictions.
  • To utilize a large dataset collected by the CDF II detector at the Tevatron.

Main Methods:

  • Analysis of proton-antiproton collision data corresponding to 4.3 fb⁻¹ of integrated luminosity.
  • Reconstruction of top-quark mass and hadronically decaying W boson mass for 756 candidate events.
  • Simultaneous fit of top-quark width and jet energy scale (Δ(JES)) using template comparisons.
  • Application of the Feldman-Cousins approach to set confidence limits.

Main Results:

  • An upper limit at 95% confidence level (CL) for the top-quark width was established at Γ(t) < 7.6 GeV.
  • A two-sided 68% CL interval for the top-quark width was determined to be 0.3 GeV < Γ(t) < 4.4 GeV.
  • These results are consistent with the Standard Model prediction for the top-quark width.

Conclusions:

  • The measurement provides a precise constraint on the top-quark width.
  • The findings support the validity of the Standard Model in the context of top-quark properties.
  • This study contributes to the ongoing effort to precisely measure fundamental particle properties.