| ||Measurement of the W mass by direct reconstruction in e(+)e(-) collisions at 172 GeV|
| ||ALEPH Collaboration|
| ||MONTE-CARLO PROGRAM,PAIR PRODUCTION,RADIATIVE-CORRECTIONS,EVENT GENERATION,QED CORRECTIONS,ENERGIES,LEP2/NLC,PHYSICS,LEP,Physics,Physics, Multidisciplinary|
| || The mass of the W boson is obtained from reconstructed invariant mass distributions in W-pair events. The sample of W pairs is selected from 10.65 pb(-1) collected with the ALEPH detector at a mean centre-of-mass energy of 172.09 GeV. The invariant mass distribution of simulated events are fitted to the experimental; distributions and the following W masses are obtained: WW --> |
, m(W) = 81.30 +/- 0.47(stat.) +/- 0.11(syst.)GeV/c(2), WW --> l nu(l=e,mu), m(W) = 80.54 +/- 0.47(stat.) +/- 0.11(syst.)GeV/c(2), WW --> tau nu, m(W) = 79.56 +/- 1.08(stat.) +/- 0.23(syst.) GeV/c(2). The statistical errors are the expected errors for Monte Carlo samples of the same integrated luminosity as the data. The combination of these three measurements gives: m(W) = 80.80 +/- 0.32(stat.) +/- 0.11(syst.) +/- 0.03(LEP energy) GeV/c(2). (C) 1998 Elsevier Science B.V.