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Author: D. Glenzinski (Enrico Fermi Institute, University of Chicago)

Title: Measurement of the W Mass from LEP2

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

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

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