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1 LPSC - Laboratoire de Physique Subatomique et de Cosmologie

Abstract : We present a measurement of the W boson mass using data collected by the D0 experiment at the Fermilab Tevatron during 1994-1995. We identify W bosons by their decays to e-nu final states where the electron is detected in a forward calorimeter. We extract the W boson mass, Mw, by fitting the transverse mass and transverse electron and neutrino momentum spectra from a sample of 11,089 W -> e nu decay candidates. We use a sample of 1,687 dielectron events, mostly due to Z -> ee decays, to constrain our model of the detector response. Using the forward calorimeter data, we measure Mw = 80.691 +- 0.227 GeV. Combining the forward calorimeter measurements with our previously published central calorimeter results, we obtain Mw = 80.482 +- 0.091 GeV.

Author: B. Abbott M. Abolins V. Abramov B.S. Acharya I. Adam D.L. Adams M. Adams S. Ahn V. Akimov G.A. Alves N. Amos E.W. Anderson M.M. B



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