Charged-particle pseudorapidity distributions in Au plus Au collisions at √SNN=62.4 GeV

被引:159
作者
Back, B. B.
Baker, M. D.
Ballintijn, M.
Barton, D. S.
Betts, R. R.
Bickley, A. A.
Bindel, R.
Busza, W.
Carroll, A.
Chai, Z.
Decowski, M. P.
Garcia, E.
Gburek, T.
George, N.
Gulbrandsen, K.
Halliwell, C.
Hamblen, J.
Hauer, M.
Henderson, C.
Hofman, D. J.
Hollis, R. S.
Holynski, R.
Holzman, B.
Iordanova, A.
Johnson, E.
Kane, J. L.
Khan, N.
Kulinich, P.
Kuo, C. M.
Lin, W. T.
Manly, S.
Mignerey, A. C.
Nouicer, R.
Olszewski, A.
Pak, R.
Reed, C.
Roland, C.
Roland, G.
Sagerer, J.
Seals, H.
Sedykh, I.
Smith, C. E.
Stankiewicz, M. A.
Steinberg, P.
Stephans, G. S. F.
Sukhanov, A.
Tonjes, M. B.
Trzupek, A.
Vale, C.
van Nieuwenhuizen, G. J.
机构
[1] Argonne Natl Lab, Argonne, IL 60439 USA
[2] Brookhaven Natl Lab, Upton, NY 11973 USA
[3] PAN, Inst Nucl Phys, Krakow, Poland
[4] MIT, Cambridge, MA 02139 USA
[5] Natl Cent Univ, Chungli 32054, Taiwan
[6] Univ Illinois, Chicago, IL 60607 USA
[7] Univ Maryland, College Pk, MD 20742 USA
[8] Univ Rochester, Rochester, NY 14627 USA
来源
PHYSICAL REVIEW C | 2006年 / 74卷 / 02期
关键词
D O I
10.1103/PhysRevC.74.021901
中图分类号
O57 [原子核物理学、高能物理学];
学科分类号
070202 ;
摘要
The charged-particle pseudorapidity density for Au+Au collisions at root s(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 root s(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.
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