Minijet deformation and charge-independent angular correlations on momentum subspace (eta, phi) in Au-Au collisions at root S-NN=130 GeV Academic Article uri icon

abstract

  • Measurements of two-particle correlations on angular difference variables 1-2 (pseudorapidity) and 1- 2 (azimuth) are presented for all primary charged hadrons with transverse momentum 0.15pt2 GeV/c and ||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 /2 or greater than /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 1-2 increases by a factor 2.3 from peripheral to central collisions, suggesting strong coupling of semi-hard scattered partons to a longitudinally-expanding medium. 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. 2006 The American Physical Society.

published proceedings

  • PHYSICAL REVIEW C

author list (cited authors)

  • Adams, J., Aggarwal, M. M., Ahammed, Z., Amonett, J., Anderson, B. D., Anderson, M., ... Zuo, J. X.

citation count

  • 160

publication date

  • June 2006