July 2003

Using data taken during Run II of the Fermilab Tevatron, the CDF and Dě collaborations have measured the ratio of production cross sections times branching ratios

The combined value from the Run II data is

Using the relation

and input from LEP and theory gives an indirect measurement of the W branching fraction to leptons of and of the W width of GeV.

When combined with similar measurements from Run I of the Tevatron, the result for the branching fraction is and for the width is

Please see our note for the details of the analysis.

click here for an eps file for the width figure.

click here for an eps file of the branching fraction figure.