Minijet deformation and charge-independent angular correlations on momentum subspace (η,ϕ) in Au-Au collisions at sNN=130 GeV

J. Adams et al. (STAR Collaboration)
Phys. Rev. C 73, 064907 – Published 29 June 2006

Abstract

Measurements of two-particle correlations on angular difference variables η1η2 (pseudorapidity) and ϕ1ϕ2 (azimuth) are presented for all primary charged hadrons with transverse momentum 0.15pt2 GeV/c and |η|1.3 from Au-Au collisions at sNN=130 GeV. Large-amplitude correlations are observed over a broad range in relative angles where distinct structures appear on the same-side and away-side (i.e., relative azimuth less than π/2 or greater than π/2). The principal correlation structures include that associated with elliptic flow plus a strong, same-side peak. It is hypothesized that the latter results from correlated hadrons associated with semi-hard parton scattering in the early stage of the heavy-ion collision which produces a jet-like correlation peak at small relative angles. The width of the jet-like peak on η1η2 increases by a factor 2.3 from peripheral to central collisions, suggesting strong coupling of semi-hard scattered partons to a longitudinally-expanding medium. The new methods of jet analysis introduced here provide access to scattered partons at low transverse momentum well below the kinematic range where perturbative quantum chromodynamics and standard fragmentation models are applicable.

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  • Received 10 April 2006

DOI:https://doi.org/10.1103/PhysRevC.73.064907

©2006 American Physical Society

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Vol. 73, Iss. 6 — June 2006

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