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T. and Wang, F. and Wang, G. and Wang, J. S. and Wang, Q. and Wang, X. and Wang, X. L. and Wang, Y. and Webb, J. C. and Westfall, G. D. and Whitten, C., Jr. and Wieman, H. and Wissink, S. W. and Witt, R. and Wu, J. and Wu, Y. and Xu, N. and Xu, Q. H. and Xu, Y. and Xu, Z. and Yang, Y. Y. and Yepes, P. and Yoo, I-K. and Yue, Q. and Zawisza, M. and Zbroszczyk, H. and Zhan, W. and Zhang, H. and Zhang, S. and Zhang, W. M. and Zhang, Y. and Zhang, Z. P. and Zhao, Y. and Zhong, C. and Zhou, J. and Zoulkarneev, R. and Zoulkarneeva, Y. and Zuo, J. X. (2008) System-Size Independence of Directed Flow Measured at the BNL Relativistic Heavy-Ion Collider. Physical Review Letters, 101 (25). Art. No. 252301. ISSN 0031-9007 http://resolver.caltech.edu/CaltechAUTHORS:20090924-104721444
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We measure directed flow (ν_1) for charged particles in Au+Au and Cu+Cu collisions at √S_(NN)=200 and 62.4 GeV, as a function of pseudorapidity (η), transverse momentum (p_t), and collision centrality, based on data from the STAR experiment. We find that the directed flow depends on the incident energy but, contrary to all available model implementations, not on the size of the colliding system at a given centrality. We extend the validity of the limiting fragmentation concept to ν_1 in different collision systems, and investigate possible explanations for the observed sign change in ν_1(p_t).
|Additional Information:||© 2008 The American Physical Society. Received 10 July 2008; published 16 December 2008. We thank the RHIC Operations Group and RCF at BNL, and the NERSC Center at LBNL and the resources provided by the Open Science Grid consortium 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 Sloan Foundation, the DFG Excellence Cluster EXC153 of Germany, CNRS/IN2P3, RA, RPL, and EMN of France, STFC and EPSRC of the United Kingdom, FAPESP of Brazil, the Russian Ministry of Science and Technology, the NNSFC, CAS, MoST, and MoE 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, Slovak Research and Development Agency, and the Korea Science and Engineering Foundation. PACS numbers: 25.75.Ld.|
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|Deposited By:||Tony Diaz|
|Deposited On:||25 Sep 2009 16:49|
|Last Modified:||26 Dec 2012 11:25|
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