Long range rapidity correlations and jet production in high energy nuclear collisions.
Journal Article
·
· Physical Review, C (Nuclear Physics)
The STAR Collaboration at the Relativistic Heavy Ion Collider presents a systematic study of high-transverse-momentum charged-di-hadron correlations at small azimuthal pair separation {Delta}{phi} in d+Au and central Au+Au collisions at {radical}s{sub NN} = 200 GeV. Significant correlated yield for pairs with large longitudinal separation {Delta}{eta} is observed in central Au+Au collisions, in contrast to d+Au collisions. The associated yield distribution in {Delta}{eta} x {Delta}{phi} can be decomposed into a narrow jet-like peak at small angular separation which has a similar shape to that found in d+Au collisions, and a component that is narrow in {Delta}{phi} and depends only weakly on {Delta}{eta}, the 'ridge.' Using two systematically independent determinations of the background normalization and shape, finite ridge yield is found to persist for trigger p{sub t} > 6 GeV/c, indicating that it is correlated with jet production. The transverse-momentum spectrum of hadrons comprising the ridge is found to be similar to that of bulk particle production in the measured range (2 < p{sub t} < 4 GeV/c).
- Research Organization:
- Argonne National Laboratory (ANL)
- Sponsoring Organization:
- SC; NSF; Sloan Foundation; EPSRC United Kingdom
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1050161
- Report Number(s):
- ANL-HEP-PR-10-29
- Journal Information:
- Physical Review, C (Nuclear Physics), Journal Name: Physical Review, C (Nuclear Physics) Journal Issue: 6 Vol. 80; ISSN 0556-2813; ISSN PRVCAN
- Country of Publication:
- United States
- Language:
- ENGLISH
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