System-size independence of directed flow measured at the BNL relativistic heavy-ion collider.
Journal Article
·
· Phys. Rev. Lett.
We measure directed flow (v{sub 1}) for charged particles in Au+Au and Cu+Cu collisions at {radical}s{sub NN} = 200 and 62.4 GeV, as a function of pseudorapidity ({eta}), transverse momentum (p{sub 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 v{sub 1} in different collision systems, and investigate possible explanations for the observed sign change in v{sub 1}(p{sub t}).
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); National Science Foundation (NSF)
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 963863
- Report Number(s):
- ANL-HEP-PR-09-76; PRLTAO; TRN: US0903312
- Journal Information:
- Phys. Rev. Lett., Vol. 101, Issue 2008; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- ENGLISH
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