Azimuthal di-hadron correlations in d+Au and Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV from STAR - INSPIRE

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Azimuthal di-hadron correlations in d+Au and Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV from STAR

STAR

Collaboration

Apr, 2010

16 pages

Published in:

Phys.Rev.C 82 (2010) 024912

e-Print:

1004.2377 [nucl-ex]

DOI:

10.1103/PhysRevC.82.024912

Experiments:

BNL-RHIC-STAR

View in:

reference search94 citations

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Abstract: (arXiv)

Yields, correlation shapes, and mean transverse momenta \pt{} of charged particles associated with intermediate to high-\pt{} trigger particles (2.5 < \pt < 10 \GeVc) in d+Au and Au+Au collisions at \snn=200 GeV are presented. For associated particles at higher \pt \gtrsim 2.5 \GeVc, narrow correlation peaks are seen in d+Au and Au+Au, indicating that the main production mechanism is jet fragmentation. At lower associated particle \pt < 2 \GeVc, a large enhancement of the near- (\dphi \sim 0) and away-side (\dphi \sim \pi) associated yields is found, together with a strong broadening of the away-side azimuthal distributions in Au+Au collisions compared to d+Au measurements, suggesting that other particle production mechanisms play a role. This is further supported by the observed significant softening of the away-side associated particle yield distribution at \dphi \sim \pi in central Au+Au collisions.

Note:

16 pages, 11 figures, updated after journal review

25.75.Nq
25.75.Bh
OSG : STAR
particle: yield
particle: production
hadron hadron: correlation
jet: fragmentation
STAR
hadron: angular distribution
charged particle: transverse momentum

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