TRANSVERSE AND LONGITUDINAL BOSE-EINSTEIN CORRELATIONS

We show how a difference in the correlation length longitudinally and transversely, with respect to the jet axis in e(+)e(-) annihilation, a rises naturally in a model for Bose-Einstein correlations based on the Lund string model. In genuine three-particle correlations the differe nce is even more apparent and they provide therefore a good probe for the longitudinal stretching of the string field. The correlation lengt h between pion pairs is found to be rather independent of the pion mul tiplicity and the kaon content of the final state. (C) 1998 Elsevier S cience B.V.