Achard, P (reprint author), Univ Geneva, CH-1211 Geneva 4, Switzerland.
Bose-Einstein correlations in W-pair production at LEP are investigated in a data sample 629 pb (1) collected by the L3 detector at roots = 189-209 GeV. Bose-Einstein correlations between pions within a W decay are observed and found to be in good agreement with those in light-quark Z decay. No evidence is found for Bose-Einstein correlations between hadrons coming from different W's in the same event. (C) 2002 Published by Elsevier Science B.V.