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A study of Bose-Einstein correlations in pairs of identically charged pionsproduced in e+e- annihilations at the Z0 peak has been performed for the firsttime assuming a non-static emitting source. The results are based on the highstatistics data obtained with the OPAL detector at LEP. The correlationfunctions have been analyzed in intervals of the average pair transversemomentum and of the pair rapidity, in order to study possible correlationsbetween the pion production points and their momenta (position-momentumcorrelations). The Yano-Koonin and the Bertsch-Pratt parameterizations havebeen fitted to the measured correlation functions to estimate the geometricalparameters of the source as well as the velocity of the source elements withrespect to the overall centre-of-mass frame. The source rapidity is found toscale approximately with the pair rapidity, and both the longitudinal andtransverse source dimensions are found to decrease for increasing average pairtransverse momenta.

Bose-Einstein study of position-momentum correlations of charged pions in hadronic Z0 decays