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Centrality dependence of charged hadron transverse momentum spectra in Au + Au collisions from square root of s(NN)=62.4 to 200 GeV

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Title: Centrality dependence of charged hadron transverse momentum spectra in Au + Au collisions from square root of s(NN)=62.4 to 200 GeV
Author(s): Back, BB; Baker, MD; Ballintijn, M; Barton, DS; Betts, RR; Bickley, AA; Bindel, R; Busza, W; Carroll, A; Chai, Z; Decowski, MP; Garcıa, E; Gburek, T; George, N; Gulbrandsen, K; Halliwell, C; Hamblen, J; Hauer, M; Henderson, C; Hofman, DJ; Hollis, RS; Hołynski, 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; Vaurynovich, SS; Verdier, R; Veres, GI; Wenger, E; Wolfs, FLH; Wosiek, B; Wozniak, K; Wysłouch, B
Subject(s): 158A GEV ENERGY
Abstract: We have measured transverse momentum distributions of charged hadrons produced in Au + Au collisions at square root s(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 square root s(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 square root s(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.
Issue Date: 2005-03-04
Publisher: American Physical Society
Citation Info: Back, B. B., Baker, M. D., Ballintijn, M., Barton, D. S., Betts, R. R., Bickley, A. A. et al. (2005). Centrality dependence of charged hadron transverse momentum spectra in Au plus Au collisions from root s(NN)=62.4 to 200 GeV. Physical Review Letters, 94 http://scitation.aip.org.proxy.cc.uic.edu/getabs/servlet/GetabsServlet?prog=normal&id=PRLTAO000094000008082304000001&idtype=cvips&gifs=yes
Type: Article
Description: Publishers Copyright - http://forms.aps.org/author/copytrnsfr.pdf
URI: http://hdl.handle.net/10027/586
ISSN: 0031-9007
Date Available in INDIGO: 2008-05-30
 

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