Journal
PHYSICAL REVIEW LETTERS
Volume 101, Issue 25, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.101.252301
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Funding
- Offices of NP and HEP
- U.S. DOE Office of Science
- U.S. NSF
- Sloan Foundation
- DFG Excellence Cluster EXC153 of Germany
- CNRS/IN2P3
- RA
- RPL
- EMN of France
- STFC
- EPSRC of the United Kingdom
- FAPESP of Brazil
- Russian Ministry of Science and Technology
- NNSFC
- CAS
- MoST
- MoE of China
- IRP
- GA of the Czech Republic
- FOM of the Netherlands
- DAE,
- DST
- CSIR of the Government of India
- Swiss NSF
- Polish State Committee for Scientific Research
- Slovak Research and Development Agency
- Korea Science and Engineering Foundation
- Science and Technology Facilities Council [PP/F001061/1] Funding Source: researchfish
- STFC [PP/F001061/1] Funding Source: UKRI
- Division Of Physics
- Direct For Mathematical & Physical Scien [0758018] Funding Source: National Science Foundation
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We measure directed flow (v(1)) for charged particles in Au + Au and Cu + Cu collisions at root s(NN) = 200 and 62.4 GeV, as a function of pseudorapidity (eta), 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 v(1) in different collision systems, and investigate possible explanations for the observed sign change in v(1)(p(t)).
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