Spin alignment of inclusive vector mesons and longitudinal polarization of
Lambda 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 be
en found to populate preferentially the helicity-zero state, a result which
has no firm theoretical explanation. The values of off-diagonal elements o
f the helicity density matrix are in agreement with a theory based on the S
tandard Model with coherent fragmentation. The longitudinal polarization of
the Lambda is well described by a model in which the constituent strange q
uark carries all of the hyperon spin.