Hadronization geometry from net-charge angular correlations on momentum subspace (η,ϕ) in Au-Au collisions at sNN=130 GeV

We present the first measurements of charge-dependent correlations on angular difference variables η1−η2 (pseudorapidity) and ϕ1−ϕ2 (azimuth) for primary charged hadrons with transverse momentum 0.15⩽pt⩽2GeV/c and |η|⩽1.3 from Au-Au collisions at sNN=130GeV. We observe correlation structures not predicted by theory but consistent with evolution of hadron emission geometry with increasing centrality from one-dimensional fragmentation of color strings along the beam direction to an at least two-dimensional hadronization geometry along the beam and azimuth directions of a hadron-opaque bulk medium.