Colour reconnection in e+e- -> W+W- at sqrt(s) = 189 - 209 GeV

Details Colour reconnection in e+e- -> W+W- at sqrt(s) = 189 - 209 GeV Colour reconnection in e+e- -> W+W- at sqrt(s) = 189 - 209 GeV

2005-08-31

arxiv.org/abs/hep-ex/0508062v1

Eur.Phys.J.C45:291-305,2006

Physics

High Energy Physics

High Energy Physics - Experiment

30 pages, 9 figures, Submitted to Euro. Phys. J. C

Scientific paper

10.1140/epjc/s2005-02439-x

The effects of the final state interaction phenomenon known as colour reconnection are investigated at centre-of-mass energies in the range sqrt(s) ~ 189-209 GeV using the OPAL detector at LEP. Colour reconnection is expected to affect observables based on charged particles in hadronic decays of W+W-. Measurements of inclusive charged particle multiplicities, and of their angular distribution with respect to the four jet axes of the events, are used to test models of colour reconnection. The data are found to exclude extreme scenarios of the Sjostrand-Khoze Type I (SK-I) model and are compatible with other models, both with and without colour reconnection effects. In the context of the SK-I model, the best agreement with data is obtained for a reconnection probability of 37%. Assuming no colour reconnection, the charged particle multiplicity in hadronically decaying W bosons is measured to be (nqqch) = 19.38+-0.05(stat.)+-0.08 (syst.).

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