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Minijet deformation and charge-independent angular correlations on momentum subspace (η, φ) in Au-Au collisions at √s_(NN) = 130 GeV

Adams, J. and Hughes, E. W. and Relyea, D. (2006) Minijet deformation and charge-independent angular correlations on momentum subspace (η, φ) in Au-Au collisions at √s_(NN) = 130 GeV. Physical Review C, 73 (6). Art. No. 064907. ISSN 0556-2813. doi:10.1103/PhysRevC.73.064907.

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Measurements of two-particle correlations on angular difference variables η1 − η2 (pseudorapidity) and φ1 − φ2 (azimuth) are presented for all primary charged hadrons with transverse momentum 0.15 ≤ p_t ≤ 2 GeV/c and |η| ≤ 1.3 from Au-Au collisions at √s_(NN) = 130 GeV. Large-amplitude correlations are observed over a broad range in relative angles where distinct structures appear on the same-side and away-side (i.e., relative azimuth less than π/2 or greater than π/2). The principal correlation structures include that associated with elliptic flow plus a strong, same-side peak. It is hypothesized that the latter results from correlated hadrons associated with semi-hard parton scattering in the early stage of the heavy-ion collision which produces a jet-like correlation peak at small relative angles. The width of the jet-like peak on η1 − η2 increases by a factor 2.3 from peripheral to central collisions, suggesting strong coupling of semi-hard scattered partons to a longitudinally-expanding medium. The new methods of jet analysis introduced here provide access to scattered partons at low transverse momentum well below the kinematic range where perturbative quantum chromodynamics and standard fragmentation models are applicable.

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Additional Information:© 2006 American Physical Society. Received 10 April 2006; published 29 June 2006. 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 U.S. DOE Office of Science; the U.S. 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.
Funding AgencyGrant Number
Department of Energy (DOE)UNSPECIFIED
Bundesministerium fur Bildung und Forschung (BMBF) (Germany)UNSPECIFIED
Institut National de Physique Nucléaire et Physique des Particules (IN2P3 ) (France)UNSPECIFIED
Russian Ministry of Science and TechnologyUNSPECIFIED
Ministry of EducationUNSPECIFIED
National Natural Science Foundation Committee (NNSFC ) (China)UNSPECIFIED
GA (Czech Republic)UNSPECIFIED
Foundation for Fundamental Research on Matter (FOM) (The Netherlands)UNSPECIFIED
Polish State Committee for Scientific ResearchUNSPECIFIED
Korea Science and Engineering Foundation (KOSEF)UNSPECIFIED
Issue or Number:6
Classification Code:PACS: 25.75.Gz
Record Number:CaltechAUTHORS:20110209-114830587
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:22096
Deposited By: Benjamin Perez
Deposited On:09 Feb 2011 21:35
Last Modified:09 Nov 2021 16:02

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