  New results on global polarization of $\Lambda$ hyperons in Au+Au collisions
at $\sqrt{s_{NN}}$ = 200 GeV reveal non-zero signal on the order of a few
tenths of a percent. Compared with lower energy results, the current
measurement shows that the polarization decreases at higher collision energy,
the trend being well reproduced by theoretical calculations. The polarization
is found to be larger in more peripheral collisions, as well as in the in-plane
than in the out-of-plane direction. The signal seems to depend on the asymmetry
between positive and negative charge in each event, which may indicate an
influence of the axial current induced by the magnetic field. In addition, the
first measurement of a local polarization along the beam direction was
performed. The results show a quadrupole modulation relative to the
second-order event plane, as expected from the elliptic flow.
