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

Abstract

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 2 GeV/c and |η| 1.3 from Au–Au collisions at VSNN = 130 GeV. 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.