Centrality dependence of charged hadron transverse momentum spectra in Au plus Au collisions from √sNN=62.4 to 200 GeV -: art. no. 082304

被引：57
|
作者：
Back, BB
Baker, MD
Ballintijn, M
Barton, DS
Betts, RR
Bickley, AA
Bindel, R
Busza, W
Carroll, A
Chai, Z
Decowski, MP
García, E
Gburek, T
George, N
Gulbrandsen, K
Halliwell, C
Hamblen, J
Hauer, M
Henderson, C
Hofman, DJ
Hollis, RS
Holynski, R
Holzman, B
Iordanova, A
Johnson, E
Kane, JL
Khan, N
Kulinich, P
Kuo, CM
Lin, WT
Manly, S
Mignerey, AC
Nouicer, R
Olszewski, A
Pak, R
Reed, C
Roland, C
Roland, G
Sagerer, J
Seals, H
Sedykh, I
Smith, CE
Stankiewicz, MA
Steinberg, P
Stephans, GSF
Sukhanov, A
Tonjes, MB
Trzupek, A
Vale, C
van Nieuwenhuizen, GJ
机构：
[1] Argonne Natl Lab, Argonne, IL 60439 USA
[2] Brookhaven Natl Lab, Upton, NY 11973 USA
[3] PAN, Inst Phys Nucl, 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 LETTERS | 2005年 / 94卷 / 08期
基金：
美国国家科学基金会;
关键词：
D O I：
10.1103/PhysRevLett.94.082304
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We have measured transverse momentum distributions of charged hadrons produced in Au+Au collisions at roots(NN) = 62.4 GeV. The spectra are presented for transverse momenta 0.25<p(T)<4.5 GeV/c, in a pseudorapidity range of 0.2<eta<1.4. The nuclear modification factor R-AA is calculated relative to p+p data at the same collision energy as a function of collision centrality. For 2<p(T)<4.5 GeV/c, R-AA is found to be significantly larger than in Au+Au collisions at roots(NN) = 130 and 200 GeV. In contrast to the large change in R-AA, we observe a very similar centrality evolution of the p(T) spectra at roots(NN) = 62.4 and 200 GeV. The dynamical origin of this surprising factorization of energy and centrality dependence of particle production in heavy-ion collisions remains to be understood.
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