Overview

This dissertation presents a direct measurement of theW boson mass (MW) and decay width (Gamma W) in 1 fb-1 of W → enu collider data at DO using a novel method to model the hadronic recoil. The mass is extracted from fits to the transverse mass M T, pT(e), and ET distributions. The width is extracted from fits to the tail of the MT distribution. The electron energy measurement is simulated using a parameterized model, and the recoil is modeled using a new technique by which Z recoils are chosen from a data library to match the pT and direction of each generated W boson. We measure the the W boson mass to be MW = 80.4035+/-0.024(stat)+/-0.039( syst) from the MT, MW = 80.4165+/-0.027(stat)+/-0.038(syst) from the pT(e), and MW = 80.4025+/-0.023(stat)+/-0.043( syst) from the ET distributions. Gamma W is measured to be GammaW = 2.025 +/- 0.038(stat) +/- 0.061(syst) GeV.

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9781244026810

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