Long range rapidity correlations and jet production in high energy nuclear collisions
- University of Illinois at Chicago, Chicago, Illinois 60607 (United States)
- Panjab University, Chandigarh 160014 (India)
- Variable Energy Cyclotron Centre, Kolkata 700064 (India)
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)
- OSTI ID:
- 21296620
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 80, Issue 6; Other Information: DOI: 10.1103/PhysRevC.80.064912; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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Long range rapidity correlations and jet production in high energy nuclear collisions
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