Abstract
Spin alignment of inclusive vector mesons and longitudinal polarization of A hyperons have been measured in a sample of 4.3 million hadronic Z 0 decays from the OPAL detector at LEP. Leading, light vector mesons have been found to populate preferentially the helicity-zero state, a result which has no firm theoretical explanation. The values of off-diagonal elements of the helicity density matrix are in agreement with a theory based on the Standard Model with coherent fragmentation. The longitudinal polarization of the A is well described by a model in which the constituent strange quark carries all of the hyperon spin.
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