The W boson mass (m{sub w}) is a key parameter of the standard model (SM), constraining the mass of the unobserved Higgs boson. Using Tevatron p{bar p} collision data from 1992-1995, the CDF and D0 collaborations measured m{sub w} to {delta}m{sub w} = 59 MeV. The ongoing Tevatron Run 2 has produced a factor of 5 more collisions, promising a significant reduction in {delta}m{sub w}. CDF has analyzed the first {approx}200 pb{sup -1} of Run 2 data and determined its {delta}m{sub w} to be 76 MeV.

Presented are measurements of the W boson mass from the D0 and CDF collaborations at the Tevatron from the 1994-1996 run. The W events are produced in p[anti p] collisions at[radical]s= 1.8 TeV. The W mass extracted from W[yields] e[nu] decays at D0 is determined to be 80.45[+-] 0.12 GeV; and from W[yields][mu][nu] decays at CDF is 80. 43[+-] 0.16 GeV. The world average W mass from the hadron collider measurements is 80.41[+-] 0.09 GeV.

This paper presents measurements of the mass of the W vector boson from the CDF and D0 experiments using data collected at (square root)s = 1.8 TeV during the 1994-1995 data taking run. CDF finds a preliminary mass of M{sub W} = 80.43 " 0.16 GeV and D0 measures a mass of M{sub W} = 80.44 " 0.12 GeV.

This is the closeout report for the grant for experimental research at the energy frontier in high energy physics. The report describes the precise measurement of the W boson mass at the CDF experiment at Fermilab, with an uncertainty of ≈ 12 MeV, using the full dataset of ≈ 9 fb-1 collected by the experiment up to the shutdown of the Tevatron in 2011. In this analysis, the statistical and most of the experimental systematic uncertainties have been reduced by a factor of two compared to the previous measurement with 2.2 fb-1 of CDF data. This research has been the culmination of the PI's track record of producing world-leading measurements of the W boson mass from the Tevatron. The PI performed the first and only measurement to date of the W boson mass using high-rapidity leptons using the D0 endcap calorimeters in Run 1. He has led this measurement in Run 2 at CDF, publishing two world-leading measurements in 2007 and 2012 with total uncertainties of 48 MeV and 19 MeV respectively. The analysis of the final dataset is currently under internal review in CDF. Upon approval of the internal review, the result will be available for public release.

This thesis presents the results of an analysis of the 3.7 {fb}^{-1} of Tevatron proton-antiproton data collected with the DZero (D0) Detector at Fermilab during the ``RunIIb34'' period, with the goal of extracting an improved measurement of the $W$ boson mass, which is currently measured to a precision of approx 20,{MeV}. The measurement is performed on events with one W boson which decays to an electron and a neutrino. Using a template technique, the mass is measured from three distributions that are correlated with the W boson mass: the transverse electron momentum, p_T^e, the transverse W mass, m_T$ and the neutrino momentum, which appears as missing transverse energy, {E}_T. A test measurement using this technique is successfully performed on a mock dataset generated with a Monte Carlo simulation. In the data, we find unexpected azimuthally dependent inconsistencies between the early and late parts of the data taking period. Implications for the completion of the data measurement are discussed.

I present a measurement of the W boson mass (M{sub W}) and width ([Gamma]{sub W}) using 200 and 350 pb−1 of CDF Run II data respectively. The measurements, performed in both the electron and muon decay channels, rely on a fit to the W transverse mass distribution. We measure M{sub W} = 80413 ± 48 MeV and [Gamma]W = 2032 ± 71 MeV which represent the world's single most precise measurements to date.

I describe the latest D0 and CDF W boson mass measurements. The D0 measurement is performed with 4.3 fb−1 of integrated luminosity in the electron decay channel with a data set of 1.68 x 108 W candidates. The value of the W boson mass measured by D0 is M{sub W} = 80.375 ± 0.023 GeV when combined with the previously analyzed 1 fb−1 of integrated luminosity. The CDF measurement uses 2.2 fb−1 of integrated luminosity in both electron and muon decay channels with a total of 1.1 x 108 W candidates. The value of the W boson mass measured by CDF is M{sub W} = 80.387 ± 0.019 GeV. I report the combination of these two measurements with previous Tevatron measurements and with the LEP measurements of the W boson mass. The new world average is M{sub W} = 80.385 ± 0.015GeV. I discuss the implications of the new measurement to the indirect measurement of the Standard Model Higgs boson mass.

The CDF and D0 collaborations have analyzed up to {approx} 200 pb{sup -1} of Run 2 physics data to measure W production properties such as the W cross section, the W width, lepton universality and the W charge asymmetry. From the cross section measurements, CDF obtains a lepton universality of g{sub {mu}}/g{sub e} = 0.998 {+-} 0.012 and g{sub {tau}}/g{sub e} = 0.99 {+-} 0.04 and an indirect W width of {Lambda}{sub W} = 2079 {+-} 41 MeV. D0 measured the W width directly and finds {Lambda}{sub W} = 2011 {+-} 142 MeV. CDF has estimated the uncertainties on the W boson mass measurements in the electron and muon decay channels and obtains an overall uncertainty of 76 MeV.

The W boson mass working group discussed the current status of the W boson mass measurement and the prospects for improving on LEP and Tevatron measurements at the LHC.