Journal
PHYSICS LETTERS B
Volume 704, Issue 5, Pages 467-473Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2011.09.075
Keywords
Azimuthal correlations; QGP; Heavy ion collisions
Funding
- RHIC Operations Group
- RCF at BNL
- NERSC Center at LBNL
- Open Science Grid consortium
- Offices of NP and HEP within the U.S. DOE Office of Science
- U.S. NSF
- Sloan Foundation
- DFG cluster of excellence 'Origin and Structure of the Universe' of Germany
- CNRS/IN2P3
- STFC
- EPSRC of the United Kingdom
- FAPESP CNPq of Brazil
- Ministry of Ed. and Sci. of the Russian Federation
- NNSFC
- CAS
- MoST
- MoE of China
- GA
- MSMT of the Czech Republic,
- FOM
- NWO of the Netherlands
- DAE
- DST
- CSIR of India
- Polish Ministry of Sci. and Higher Ed.
- Korea Research Foundation
- Ministry of Sci., Ed. and Sports of the Rep. Of Croatia
- Russian Ministry of Sci. and Tech, and RosAtom of Russia
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We present first measurements of the evolution of the differential transverse momentum correlation function, C, with collision centrality in Au + Au interactions at root s(NN) = 200 GeV. This observable exhibits a strong dependence on collision centrality that is qualitatively similar to that of number correlations previously reported. We use the observed longitudinal broadening of the near-side peak of C with increasing centrality to estimate the ratio of the shear viscosity to entropy density, eta/s, of the matter formed in central Au + Au interactions. We obtain an upper limit estimate of eta/s that suggests that the produced medium has a small viscosity per unit entropy. (C) 2011 Elsevier B.V. All rights reserved.
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