Abstract
The production of WW pairs at LEP allows interference effect between the hadronic systems of the two W bosons to be studied, such as Bose-Einstein interference and possible signatures or ‘colour reconnection’ have been investigated. As yet, ALEPH sees no compelling evidence for colour reconnection nor for Bose-Einstein interference between the W systems. In related studies of the predictions of various Monte Carlo models for colour reconnection effects, it is noted that there is no large multiplicity shift due to colour reconnection in the Herwig model when appropritely re-tuned to correctly described the Z data.
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