Constraint on Δg(x) from π⁰ production at RHIC

We determine the polarized gluon distribution Δg(x) by a global analysis using current DIS and π⁰ asymmetry data. The π⁰ data from RHIC‐Spin experiments provide a strong constraint on Δg(x), so that its uncertainty is reduced. However, a sign problem appears in the analysis using π⁰ data, which means that positive and negative distributions are allowed for Δg(x). These two types of solutions are discussed.