Abstract
The study of the directional dependence of two-particle correlations in the hadronic decays of the Z 0 boson is performed using the data collected by the DELPHI experiment in the 1992–1995 running periods. The comparison between the transverse, R ⊥, and longitudinal, R ∥, correlation radii confirms the string model prediction that the transverse correlation length is smaller than the longitudinal one, with the measured values of R ⊥=0.53±0.08 fm and R ∥=0.85±0.08 fm , for selected Z 0→q q ̄ events.
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