Spin
transfers from initial polarized protons to final particles, in view
of the quark-parton model, represent an important window for studying
spin properties of both primary parton interactions and final jet
fragmentation. For the last decade, spin transfers to strange and
charmed hyperons at high energies have been the subject of a number
of extensive theoretical studies. Large spin transfers have been
observed in fixed target FNAL E704 and E665 experiments as well as
NOMAD experiment, using CERN SPS neutrino beam.
In this report, we discuss the PHENIX measurements of spin transfers from
longitudinally polarized protons to hyperons at sqrt{s} = 200 GeV.