Colour reconnection studies in e+e-→W+W- at √s = 183 GeV

The OPAL Collaboration

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


The predicted effects of final state interactions such as colour reconnection are investigated by measuring properties of hadronic decays of W bosons, recorded at a centre-of-mass energy of √s ≃ 182.7 GeV in the OPAL detector at LEP. Dependence on the modelling of hadronic W decays is avoided by comparing W+W-→qq̄′qq̄′ events with the non-leptonic component of W+W-→qq̄′ℓv̄ events. The scaled momentum distribution, its mean value, 〈xp〉, and that of the charged particle multiplicity, 〈nch〉, are measured and found to be consistent in the two channels. The measured differences are: Δ〈nch〉 = 〈nch4q〉 - 2〈nchqqℓv〉 = +0.7 ± 0.6 Δ〈xp〉 = 〈xp4q〉 - 〈xpqqℓv〉 = (-0.09 ± 0.09 ± 0.05) × 10-2 In addition, measurements of rapidity and thrust are performed for W+W-→ qq̄′qq̄′ events. The data are described well by standard QCD models and disfavour one model of colour reconnection within the ARIADNE program. The current implementation of the Ellis-Geiger model of colour reconnection is excluded. At the current level of statistical precision no evidence for colour reconnection effects was found in the observables studied. The predicted effect of colour reconnection on OPAL measurements of MW is also quantified in the context of models studied.

Original languageEnglish
Pages (from-to)153-168
Number of pages16
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number1-2
StatePublished - 1 Jan 1999
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


Dive into the research topics of 'Colour reconnection studies in e+e-→W+W- at √s = 183 GeV'. Together they form a unique fingerprint.

Cite this