| This thesis describes a measurement of the W vector boson total width, GammaW, from the tail of the W transverse mass distribution. The 90 pb-1 of data used in this thesis were collected by the Collider Detector at Fermilab (CDF) from pp collisions at a center-of-mass energy of s = 1.8TeV. Fitting a Monte Carlo simulation to the data over the W transverse mass distribution in the range 100 GeV < MT < 200 GeV, we find that GW=1.78+0.20-0.19 stat.+/- syst. GeV. |