Azimuthal di-hadron correlations in d+ Au and Au + Au collisions at {radical}(s{sub NN})=200 GeV measured at the STAR detector

Journal Article · Sun Aug 15 00:00:00 EDT 2010 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.82.024912· OSTI ID:21419455

Aggarwal, M M; Bhati, A K; Pruthi, N K ^[1]; Ahammed, Z; Dong, X; Grebenyuk, O; Hjort, E; Horner, M J; Jacobs, P; Kikola, D P; Kiryluk, J; Klein, S R; Masui, H; Matis, H S; Odyniec, G; Olson, D; Ploskon, M A; Poskanzer, A M; Powell, C B; Ritter, H G ^[2]

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1. Panjab University, Chandigarh 160014 (India)
2. Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)

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 N{sub N}})=200 GeV are presented. For associated particles at higher p{sub T} > or 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.

• OSTI ID: 21419455
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 82, Issue 2; Other Information: DOI: 10.1103/PhysRevC.82.024912; (c) 2010 The American Physical Society; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ATOM-ATOM COLLISIONS
BARYON-BARYON INTERACTIONS
CHARGED PARTICLES
COLLISIONS
CORRELATIONS
DISTRIBUTION
FRAGMENTATION
GEV RANGE 100-1000
HADRONS
PARTICLE PRODUCTION
TRANSVERSE MOMENTUM
ATOM COLLISIONS
ELEMENTARY PARTICLES
ENERGY RANGE
GEV RANGE
HADRON-HADRON INTERACTIONS
INTERACTIONS
LINEAR MOMENTUM
PARTICLE INTERACTIONS