Charged-particle pseudorapidity distributions in Au+Au collisions at {radical}(s{sub NN})=62.4 GeV

Journal Article · Tue Aug 15 00:00:00 EDT 2006 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.74.021901· OSTI ID:20863693

Back, B B ^[1]; Baker, M D; Barton, D S; Carroll, A; Chai, Z; George, N; Hauer, M; Holzman, B; Pak, R; Seals, H; Sedykh, I; Stankiewicz, M A; Steinberg, P; Sukhanov, A ^[2]; Ballintijn, M; Busza, W; Decowski, M P; Gulbrandsen, K; Henderson, C; Kane, J L ^[3]

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1. Argonne National Laboratory, Argonne, Illinois 60439-4843 (United States)
2. Brookhaven National Laboratory, Upton, New York 11973-5000 (United States)
3. Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307 (United States)

The charged-particle pseudorapidity density for Au+Au collisions at {radical}(s{sub NN})=62.4 GeV has been measured over a wide range of impact parameters and compared to results obtained at other energies. As a function of collision energy, the pseudorapidity distribution grows systematically both in height and width. The midrapidity density is found to grow approximately logarithmically between BNL Alternating Gradient Synchrotron (AGS) energies and the top BNL Relativistic Heavy Ion Collider (RHIC) energy. There is also an approximate factorization of the centrality and energy dependence of the midrapidity yields. The new results at {radical}(s{sub NN})=62.4 GeV confirm the previously observed phenomenon of ''extended longitudinal scaling'' in the pseudorapidity distributions when viewed in the rest frame of one of the colliding nuclei. It is also found that the evolution of the shape of the distribution with centrality is energy independent, when viewed in this reference frame. As a function of centrality, the total charged particle multiplicity scales linearly with the number of participant pairs as it was observed at other energies.

• OSTI ID: 20863693
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 74, Issue 2; Other Information: DOI: 10.1103/PhysRevC.74.021901; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BROOKHAVEN RHIC
CHARGED PARTICLES
DISTRIBUTION
ENERGY DEPENDENCE
FACTORIZATION
GEV RANGE
GOLD 197 REACTIONS
GOLD 197 TARGET
IMPACT PARAMETER
MULTIPLICITY
NUCLEAR REACTION YIELD
PARTICLE RAPIDITY