Adams, J. and Hughes, E. W. and Relyea, D. (2007) Two-particle correlations on transverse momentum and momentum dissipation in Au–Au collisions at √sNN = 130 GeV. Journal of Physics G: Nuclear and Particle Physics, 34 (5). pp. 799-817. ISSN 0954-3899 http://resolver.caltech.edu/CaltechAUTHORS:20100927-092443520
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Measurements of two-particle correlations on transverse momentum p_t for Au–Au collisions at √^sNN = 130 GeV are presented. Significant largemomentum-scale correlations are observed for charged primary hadrons with 0.15 ≤ p_t ≤ 2 GeV/c and pseudorapidity |η| ≤ 1.3. Such correlations were not observed in a similar study at lower energy and are not predicted by theoretical collision models. Their direct relation to mean-p_t fluctuations measured in the same angular acceptance is demonstrated. Positive correlations are observed for pairs of particles which have large pt values while negative correlations occur for pairs in which one particle has large p_t and the other has much lower p_t . The correlation amplitudes per final state particle increase with collision centrality. The observed correlations are consistent with a scenario in which the transverse momentum of hadrons associated with initial-stage semi-hard parton scattering is dissipated by the medium to lower p_t.
|Additional Information:||© 2007 IOP Publishing Ltd. Received 14 November 2006. Published 30 March 2007. We thank the RHIC Operations Group and RCF at BNL, and the NERSC Center at LBNL for their support. This work was supported in part by the Offices of NP and HEP within the US DOE Office of Science; the US NSF; the BMBF of Germany; IN2P3, RA, RPL, and EMN of France; EPSRC of the United Kingdom; FAPESP of Brazil; the Russian Ministry of Science and Technology; the Ministry of Education and the NNSFC of China; IRP and GA of the Czech Republic, FOM of the Netherlands, DAE, DST and CSIR of the Government of India; Swiss NSF; the Polish State Committee for Scientific Research; SRDA of Slovakia and the Korea Sci. & Eng. Foundation.|
|Classification Code:||PACS: 25.75.Gz; 24.60.Ky; 24.85.+p; 27.80.+w|
|Official Citation:||The STAR Collaboration et al 2007 J. Phys. G: Nucl. Part. Phys. 34 799 doi: 10.1088/0954-3899/34/5/002|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||11 Nov 2010 23:36|
|Last Modified:||26 Dec 2012 12:27|
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