Measurement of the mass of the W boson using direct reconstruction at S**(1/2) = 183-GeV
Collaboration
17 pages
Published in:
- Phys.Lett.B 462 (1999) 410-424
Report number:
- CERN-EP-99-079,
- CERN-EP-99-79
Experiments:
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Abstract: (Elsevier)
From data corresponding to an integrated luminosity of 53.5 pb −1 taken during the 183 GeV run in 1997, DELPHI has measured the W mass from direct reconstruction of WW →ℓ ν ̄ q q ̄ and WW → q q ̄ q q ̄ events. Combining these channels, a value of m W =80.238±0.154 (stat) ±0.035 (syst) ±0.035 (fsi) ±0.021 (LEP) GeV/c 2 is obtained, where fsi denotes final state interaction. Combined with the W mass obtained by DELPHI from the WW production cross-section and with the direct measurement at 172 GeV this leads to a measured value of m W =80.270±0.137 (stat) ±0.031 (syst) ±0.030 (fsi) ±0.021 (LEP) GeV/c 2 , in good agreement with the Standard Model expectation. The width of the W boson is also measured, giving the value Γ W =2.48±0.40 (stat) ±0.10 (syst) GeV/c 2 .- electron positron: colliding beams
- electron positron: annihilation
- W: pair production
- W: mass
- W: leptonic decay
- W: hadronic decay
- W: width
- DELPHI
- experimental results
- CERN LEP Stor
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