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An alternative model of the fragmentation of the Lund string, investigatingthe hypothesis of helix-like ordered gluon field, is compared with hadronic$Z^0$ data. A significant improvement in the description of various measuredquantities is achieved. In particular, the existence of correlations betweenlongitudinal and transverse components of hadron momenta (as suggested by thehelix string model) seems to be supported by the data.

Tuning of the helix string model on the DELPHI $Z^0\rightarrow q\bar{q}$ data