by Dr Tim Andeen (CERN)
The experimental precision on the W boson mass is currently the limiting factor in our ability to constrain the mass of the Higgs boson through the internal consistency of the standard model. I will present a measurement of the W boson mass using DØ data collected from 2002 to 2006 corresponding to 1 fb−1 of data which yields, after selection, 499,830 W → eν candidates. The W mass is measured using the transverse mass, electron transverse momentum and missing transverse energy distributions. The result is the most precise measurement of the W boson mass from a single experiment to date. The dominant uncertainties of this measurement are statistical in nature and the prospects for improvements with the additional data already available will be discussed.