Measurement of the W mass in e +e − collisions at 183 GeV
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...
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Veröffentlicht in: | Physics letters. B 1999, Vol.453 (1), p.121-137 |
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Hauptverfasser: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | 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. |
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ISSN: | 0370-2693 1873-2445 |
DOI: | 10.1016/S0370-2693(99)00305-6 |