Measurement of Bose-Einstein Correlations in e+e- -> W+W- at   root(s)=189GeV
  We investigate Bose-Einstein correlations (BEC) in W-pair production at root(s)=189GeV using the L3 detector at LEP. We observe BEC between particles from a single W decay in good agreement with those from a light-quark Z decay sample. We investigate their possible existence between particles coming from different W's. No evidence for such inter-W BEC is found. 
L3 Collaboration