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Colour reconnection studies in e(+)e(-)-> W+W- at root s=183 GeV

Abbiendi, G; Ackerstaff, K; Alexander, G; Allison, J; Altekamp, N; Anderson, KJ; Anderson, S; ... OPAL Collaboration, ; + view all (1999) Colour reconnection studies in e(+)e(-)-> W+W- at root s=183 GeV. PHYS LETT B , 453 (1-2) 153 - 168.

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Abstract

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 root s similar or equal to 182.7 GeV in the OPAL detector at LEP. Dependence on the modelling of hadronic W decays is avoided by comparing W+W- --> q (q) over bar q (q) over bar events with the non-leptonic component of W+W- --> q (q) over bar'l<(nu)over bar>(l) events. The scaled momentum distribution, its mean value, [x(p)], and that of the charged particle multiplicity, [n(ch)], are measured and found to be consistent in the two channels. The measured differences are:Delta[n(ch)] = [n(ch)(4q)] - 2[n(ch)(qql nu)] = + 0.7 +/- 0.8 +/- 0.6Delta[x(p)] = [x(p)(4q)] - [x(p)(qql nu)] = (- 0.09 +/- 0.09 +/- 0.05) X 10(-2)In addition, measurements of rapidity and thrust are performed for W+W- --> q (q) over bar'q (q) over bar' 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 M-W is also quantified in the context of models studied. (C) 1999 Published by Elsevier Science B.V. All rights reserved.

Type: Article
Title: Colour reconnection studies in e(+)e(-)-> W+W- at root s=183 GeV
Keywords: MONTE-CARLO, EVENT GENERATOR, PROGRAM, COLLISIONS, QCD, SIMULATION, DETECTOR, CASCADES, SPACE, MASS
UCL classification: UCL > School of BEAMS
UCL > School of BEAMS > Faculty of Maths and Physical Sciences
URI: http://discovery.ucl.ac.uk/id/eprint/1303375
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