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L3 preliminary data of two-particle Bose-Einstein correlations are reportedfor hadronic Z^0 decays in e+e- annihilation at LEP. The invariant relativemomentum Q is identified as the eigenvariable of the measured correlationfunction. Significant anti-correlations are observed in the Bose-Einsteincorrelation function in a broad region of 0.5 - 1.6 GeV with a minimum at Qclose to 0.8 GeV. Absence of Bose-Einstein correlations is demonstrated in theregion above Q >= 1.6 GeV. The effective source size is found to decrease withincreasing value of the transverse mass of the pair, similarly to hadron-hadronand heavy ion reactions. These feautes and our data are described well by thenon-thermal tau-model, which is based on strong space-timemomentum-correlations.

Detailed L3 measurements of Bose-Einstein correlations and a region of anti-correlations in hadronic Z^0 decays at LEP