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Direct measurement of the W boson width.

V M Abazov1, B Abbott, M Abolins

  • 1Joint Institute for Nuclear Research, Dubna, Russia.

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|April 7, 2010
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This study directly measured the W boson width using 1 fb^-1 of data from the Fermilab Tevatron. The W boson width was found to be 2.028 +/- 0.072 GeV, consistent with the Standard Model.

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Area of Science:

  • Particle Physics
  • High-Energy Physics
  • Standard Model Physics

Background:

  • The W boson is a fundamental particle mediating the weak nuclear force.
  • Precise measurements of W boson properties test the Standard Model and search for new physics.

Purpose of the Study:

  • To directly measure the width of the W boson.
  • To compare the measured width with Standard Model predictions.

Main Methods:

  • Analysis of W --> enu candidate events from D0 detector data at the Fermilab Tevatron.
  • Utilizing the shape of the transverse mass distribution.
  • Employing a new recoil modeling method based on a recoil library.

Main Results:

  • A direct measurement of the W boson width was obtained.
  • The measured width is 2.028 +/- 0.072 GeV.
  • The result is in agreement with the Standard Model predictions.

Conclusions:

  • The direct measurement of the W boson width is consistent with the Standard Model.
  • This measurement contributes to the precision tests of the electroweak sector.