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Phys. Rev. Lett. 100, 071801 (2008) [7 pages]

Direct Measurement of the W Boson Width in pp̅ Collisions at s=1.96  TeV

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T. Aaltonen et al. CDF Collaboration
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Received 22 October 2007; published 19 February 2008

A direct measurement of the total decay width of the W boson ΓW is presented using 350  pb-1 of data from pp̅ collisions at s=1.96  TeV collected with the CDF II detector at the Fermilab Tevatron. The width is determined by normalizing predicted signal and background distributions to 230 185 W candidates decaying to eν and μν in the transverse-mass region 50<MT<90  GeV and then fitting the predicted shape to 6055 events in the high-MT region, 90<MT<200  GeV. The result is ΓW=2032±45stat±57syst  MeV, consistent with the standard model expectation.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.071801
DOI:
10.1103/PhysRevLett.100.071801
PACS:
13.38.Be, 14.70.Fm