Minijet deformation and charge-independent angular correlations on momentum subspace $(\eta ,\varphi )$ in Au-Au collisions at $\sqrt{s_{NN}}$ = 130 GeV

Abstract

First measurements of charge-independent correlations on angular difference variables ${\eta }_1-{\eta }_2$ (pseudorapidity) and ${\varphi }_1-{\varphi }_2$ (azimuth) are presented for primary charged hadrons with transverse momentum $0.15\le p_t\le 2$ GeV/$c$ and $|\eta |\le 1.3$ from Au-Au collisions at $\sqrt{s_{NN}}=130$ GeV. Strong charge-independent angular correlations are observed associated with jet-like structures and elliptic flow. The width of the jet-like peak on ${\eta }_1-{\eta }_2$ increases by a factor 2.3 from peripheral to central collisions, suggesting strong coupling of semi-hard scattered partons to a longitudinally-expanding medium. New methods of jet analysis introduced here provide evidence for nonperturbative QCD medium effects in heavy ion collisions.

8 pages, 4 figures

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