A novel method of determining the mass of the W boson in the channel is presented and applied to 667 pb-1 of data recorded at center-of-mass energies in the range 183-207 GeV with the OPAL detector at LEP. The measured energies of charged leptons and the results of a new procedure based on an approximate kinematic reconstruction of the events are combined to give: where the first error is statistical and the second is systematic. The systematic error is dominated by the uncertainty on the lepton energy, which is calibrated using data, and the parameterization of the variables used in the fitting, which is obtained using Monte Carlo events. Both of these are limited by statistics.
This challenging channel contributes to the precision of the W mass measurement. Kartvelishvili developed the fitting methods and made the first applications to the data. This measurement makes a contribution to the global electroweak fit which constrains the mass of the standard model Higgs boson. RAE_import_type : Journal article RAE_uoa_type : Physics