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We study effects on the W mass measurements at LEP2 from non-perturbativeinterference effects in the fully hadronic decay channel. Based on a model forBose-Einstein interference, which is in agreement with LEP1 data, we argue thatthere are no Bose-Einstein correlations between bosons coming from thedifferent W's. For small reconnection probabilities we rule out the possibleexperimental signal of colour interference at LEP2, suggested in previous work.The conclusions from this paper are that the theoretical uncertainties in the Wmass determination should be smaller than the experimental statistical error.Comment: 12+1 page

Bose-Einstein and colour interference in W-pair decays