Constraint on $\Delta g(x)$ at large $x$
  We investigate the polarized gluon distribution \Delta g(x) by a global analysis of current DIS data and the \pi^0 data from RHIC-Spin experiments. The \pi^0 data provide a strong constraint on \Delta g(x), so that its uncertainty is reduced. Furthermore, new DIS data of COMPASS and HERMES play an important role in determining \Delta g(x) at large x. 
M. Hirai, S. Kumano, and N. Saito (Asymmetry Analysis Collaboration)