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Bose-Einstein correlations in pairs of identical particles were analyzed ine+ e- multihadron annihilations at ~91.2 GeV at LEP. The first studies involvedidentical charged pions and the emitting source size was determined. Then thestudy of charged kaons suggested that the radius depends on the mass of theemitted particles. Subsequenty the dependence of the source radius on the eventmultiplicity was analyzed. The study of the correlations in neutral pions andneutral kaons extended these concepts to neutral particles. The shape of thesource was analyzed in 3 dimensions and was found not to be sphericallysymmetric. In recent studies at LEP the correlations were analyzed in intervalsof the average pair transverse momentum and of the pair rapidity to study thecorrelations between the pion production points and their momenta(position-momentum correlations). The latest e+ e- data are consistent with anexpanding source.

Bose-Einstein Correlations in Multihadron Events at LEP