Hadronization geometry from net-charge angular correlations on momentum subspace in Au–Au collisions at

作者：STAR Collaboration; J. Adams; M.M. Aggarwal; Z. Ahammed; J. Amonett; B.D. Anderson; D. Arkhipkin; G.S. Averichev; S.K. Badyal; Y. Bai; J. Balewski; O. Barannikova; L.S. Barnby; J. Baudot; S. Bekele; V.V. Belaga; A. Bellingeri-Laurikainen; R. Bellwied; J. Berger; B.I. Bezverkhny; S. Bharadwaj; et al.

来源：Physics Letters B, 2006, 634(4): 347-355.

• Net-charge correlations
• Net-charge fluctuations
• Hadronization
• Heavy ion collisions

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.