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Title: Measurement of two-particle correlations with respect to second- and third-order event planes in Au + Au collisions at s NN = 200 GeV

Journal Article · · Physical Review C
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We present measurements of azimuthal correlations of charged hadron pairs in √sNN=200 GeV Au+Au collisions for the trigger and associated particle transverse-momentum ranges of 1 < ptT < 10GeV/c and 0.5 < paT < 10GeV/c. After subtraction of an underlying event using a model that includes higher-order azimuthal anisotropy v2, v3, and v4, the away-side yield of the highest trigger-pT(ptT > 4GeV/c) correlations is suppressed compared with that of correlations measured in p+p collisions. At the lowest associated particle pT(0.5 < paT < 1GeV/c), the away-side shape and yield are modified relative to those in p + p collisions. These observations are consistent with the scenario of radiative-jet energy loss. For the low-pT trigger correlations (2 < ptT < 4GeV/c), a finite away-side yield exists and we explore the dependence of the shape of the away-side within the context of an underlying-event model. Correlations are also studied differentially versus event-plane angle Ψ2 and Ψ3. The angular correlations show an asymmetry when selecting the sign of the difference between the trigger-particle azimuthal angle and the Ψ2 event plane. This asymmetry and the measured suppression of the pair yield out-of-plane is consistent with a path-length-dependent energy loss. No Ψ3 dependence can be resolved within experimental uncertainties.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Iowa State Univ., Ames, IA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP); USDOE
Contributing Organization:
PHENIX Collaboration
Grant/Contract Number:
SC0012704; FG02-92ER40692
OSTI ID:
1511094
Alternate ID(s):
OSTI ID: 1514495; OSTI ID: 1599711
Report Number(s):
BNL-211626-2019-JAAM; PRVCAN
Journal Information:
Physical Review C, Vol. 99, Issue 5; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 15 works
Citation information provided by
Web of Science

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