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System-Size Independence of Directed Flow Measured at the BNL Relativistic Heavy-Ion Collider (2008)

Abstract
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).

Publication details
Download http://authors.library.caltech.edu/16038/1/Abelev2008p2724Phys_Rev_Lett.pdf
http://resolver.caltech.edu/CaltechAUTHORS:20090924-104721444
Publisher American Physical Society
Repository Caltech Authors (United States)
Type Article, PeerReviewed
Relation http://resolver.caltech.edu/CaltechAUTHORS:20090924-104721444
http://authors.library.caltech.edu/16038/