Minijet deformation and charge-independent angular correlations on momentum subspace (η, φ) in Au-Au collisions at √sNN = 130 GeV (CROSBI ID 210373)
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Podaci o odgovornosti
Adams, J. ; ... ; Planinić, Mirko ; ... ; Poljak, Nikola ; ... ; Zuo, J.X.
STAR Collaboration
engleski
Minijet deformation and charge-independent angular correlations on momentum subspace (η, φ) in Au-Au collisions at √sNN = 130 GeV
Measurements of two-particle correlations on angular difference variables η1−η2 (pseudorapidity) and ϕ1−ϕ2 (azimuth) are presented for all primary charged hadrons with transverse momentum 0.15≤pt≤2 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 η1−η2 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.
minijet ; STAR
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Podaci o izdanju
73
2006.
64907
10
objavljeno
0556-2813
1089-490X
10.1103/PhysRevC.73.064907