Transverse momentum correlations and minijet dissipation in Au-Au collisions at s(NN)**(1/2)-GeV - INSPIRE

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Transverse momentum correlations and minijet dissipation in Au-Au collisions at s(NN)**(1/2)-GeV

STAR

Collaboration

Aug, 2004

6 pages

Published in:

J.Phys.G 34 (2007) 799-816

e-Print:

nucl-ex/0408012 [nucl-ex]

DOI:

10.1088/0954-3899/34/5/002

Experiments:

BNL-RHIC-STAR

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Abstract:

Measurements of two-particle correlations on transverse momentum

p_t

for Au-Au collisions at

\sqrt{s_{NN}} = 130

GeV are presented. Significant large-momentum-scale correlations are observed for charged primary hadrons with

0.15 \leq p_t \leq 2

GeV/

c

and pseudorapidity

|\eta| \leq 1.3

. Such correlations were not observed in a similar study at lower energy and are not predicted by theoretical collision models. Their direct relation to mean-

p_t

fluctuations measured in the same angular acceptance is demonstrated. Positive correlations are observed for pairs of particles which have large

p_t

values while negative correlations occur for pairs in which one particle has large

p_t

and the other has much lower

p_t

. The correlation amplitudes per final state particle increase with collision centrality. The observed correlations are consistent with a scenario in which the transverse momentum of hadrons associated with initial-stage semi-hard parton scattering is dissipated by the medium to lower

p_t

.

Note:

12 pages, 5 figures

24.60.Ky
25.75.Gz
24.60.-k
25.75.-q
nucleus nucleus: colliding beams
scattering: heavy ion
gold
hadron: multiple production
correlation: (2charged particle)
transverse momentum: correlation

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