Measurement of the W Mass from LEP2

Abstract

In 1997 each LEP experiment collected approximately $55{pb}^{-1}$ of data at a center-of-mass energy of 183 GeV. These data yield a sample of candidate $e^{+}{e}^{-}\to W^{+}{W}^{-}$ events from which the mass of the W boson, M_W, is measured. The preliminary LEP combined result, including data taken at $\roots = 161$ and 172 GeV and assuming the Standard Model relation between the W decay width and mass, is $M_W=80.38\pm 0.07(exp)\pm 0.03(CR/BE)\pm 0.02(E_{bm})$ GeV, where the uncertainties correspond to experimental, colour-reconnection/Bose-Einstein, and LEP beam energy respectively.

7 pages, 1 figure. Proceedings for talk 1-12 given at the DPF99 Conference in Los Angeles, California