Measurement of the W mass in e+ee^+ e^- collisions at 183 GeV

Abstract

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 57 pb1^{-1} collected with the ALEPH detector in 1997 at a centre-of-mass energy of 183 GeV. The invariant mass distributions of reweighted Monte Carlo events are fitted separately to the experimental distributions in the qqbarqqbarqqbarqqbar and all l\nuqqbar channels to give the following W masses: mWhadronic=80.461±0.177(stat.)±0.045(syst.)±0.056(theory)GeV/c2m_{W}^{hadronic} = 80.461 \pm 0.177(stat.) \pm 0.045(syst.) \pm 0.056(theory) GeV/c^2, mWsemileptonic=80.326±0.184(stat.)±0.040(syst.)GeV/c2m_{W}^{semileptonic} = 80.326 \pm 0.184(stat.) \pm 0.040(syst.) GeV/c^2 where the theory error represents the possible effects of final state interactions. The combination of these two measurements, including the LEP energy calibration uncertainty, gives $m_{W} = 80.393 \pm 0.128(stat.)\pm 0.041(syst.) \pm 0.028(theory)\pm 0.021(LEP) GeV/c^2

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This paper was published in HAL Clermont Université.

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