Azimuthal di-hadron correlations in d + Au and Au+Au collisions at √sNN = 200 GeV measured at the STAR detector

Yields, correlation shapes, and mean transverse momenta p{sub T} of charged particles associated with intermediate- to high-p{sub T} trigger particles (2.5 < p{sub T} < 10 GeV/c) in d+ Au and Au + Au collisions at {radical}s{sub NN} = 200 GeV are presented. For associated particles at higher p...

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Bibliographic Details
Published in:Physical review. C, Nuclear physics Nuclear physics, 2010-08, Vol.82 (2)
Main Authors: Aggarwal, M.M., Dunlop, J., et al
Format: Article
Language:English
Subjects:
CHARGED PARTICLES
COLLISIONS
DEUTERIUM
DISTRIBUTION
FRAGMENTATION
GOLD
NUCLEAR PHYSICS AND RADIATION PHYSICS
PARTICLE PRODUCTION
relativistic heavy ion collider
TRANSVERSE MOMENTUM
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Summary:Yields, correlation shapes, and mean transverse momenta p{sub T} of charged particles associated with intermediate- to high-p{sub T} trigger particles (2.5 < p{sub T} < 10 GeV/c) in d+ Au and Au + Au collisions at {radical}s{sub NN} = 200 GeV are presented. For associated particles at higher p{sub T} {approx}> 2.5 GeV/c, narrow correlation peaks are seen in d + Au and Au + Au, indicating that the main production mechanism is jet fragmentation. At lower associated particle p{sub T} < 2 GeV/c, a large enhancement of the near-({Delta}{phi}{approx}0) and away-side ({Delta}{phi}{approx}{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 {Delta}{phi}{approx}{pi} in central Au + Au collisions.
ISSN:0556-2813
1089-490X
DOI:10.1103/PhysRevC.82.024912