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26 April 2024

» pubmed » pmid15783881

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Centrality dependence of charged hadron transverse momentum spectra in Au+Au collisions from sqrt[s(NN)]=62.4 to 200 GeV
B B Back ; M D Baker ; M Ballintijn ; D S Barton ; R R Betts ; A A Bickley ; R Bindel ; W Busza ; A Carroll ; Z Chai ; M P Decowski ; E García ; T Gburek ; N George ; K Gulbrandsen ; C Halliwell ; J Hamblen ; M Hauer ; C Henderson ; D J Hofman ; R S Hollis ; R Ho?y?ski ; B Holzman ; A Iordanova ; E Johnson ; J L Kane ; N Khan ; P Kulinich ; C M Kuo ; W T Lin ; S Manly ; A C Mignerey ; R Nouicer ; A Olszewski ; R Pak ; C Reed ; C Rol ; G Rol ; J Sagerer ; H Seals ; I Sedykh ; C E Smith ; M A Stankiewicz ; P Steinberg ; G S F Stephans ; A Sukhanov ; M B Tonjes ; A Trzupek ; C Vale ; G J van Nieuwenhuizen ; S S Vaurynovich ; R Verdier ; G I Veres ; E Wenger ; F L H Wolfs ; B Wosiek ; K Wo?niak ; B Wys?ouch ;
Date:	4 Mar 2005
Journal:	Phys Rev Lett, 94 (8), 082304
Abstract:	We have measured transverse momentum distributions of charged hadrons produced in Au+Au collisions at sqrt[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 sqrt[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 sqrt[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.
Source:	PubMed, pmid15783881
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