Measurement of the mass in collisions at 183-GeV
Feb, 199921 pages
Published in:
- Phys.Lett.B 453 (1999) 121-137
Report number:
- CERN-EP-99-027,
- CERN-EP-99-27
Experiments:
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Abstract: (Elsevier)
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 pb −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 q q ̄ q q ̄ and all ℓν q q ̄ channels to give the following W masses: m W hadronic =80.461±0.177 (stat.) ±0.045 (syst.) ±0.056 (theory) GeV /c 2 , m W semileptonic =80.326±0.184 (stat.) ±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±0.128 (stat.) ±0.041 (syst.) ±0.028 (theory) ±0.021 (LEP) GeV /c 2 .- electron positron: colliding beams
- electron positron: annihilation
- W: pair production
- W: mass
- W: leptonic decay
- W: hadronic decay
- ALEPH
- experimental results
- CERN LEP Stor
- electron positron --> 2W
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