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24 April 2024

» pubmed » pmid16803231

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System size and centrality dependence of charged hadron transverse momentum spectra in Au + Au and Cu + Cu collisions at square root of SNN = 62.4 and 200 GeV
B Alver ; B B Back ; M D Baker ; M Ballintijn ; D S Barton ; R R Betts ; R Bindel ; W Busza ; Z Chai ; V Chetluru ; E García ; T Gburek ; K Gulbrandsen ; J Hamblen ; I Harnarine ; C Henderson ; D J Hofman ; R S Hollis ; R Ho?y?ski ; B Holzman ; A Iordanova ; J L Kane ; P Kulinich ; C M Kuo ; W Li ; W T Lin ; C Loizides ; S Manly ; A C Mignerey ; R Nouicer ; A Olszewski ; R Pak ; C Reed ; E Richardson ; C Rol ; G Rol ; J Sagerer ; I Sedykh ; C E Smith ; M A Stankiewicz ; P Steinberg ; G S F Stephans ; A Sukhanov ; A Szostak ; M B Tonjes ; A Trzupek ; G J van Nieuwenhuizen ; S S Vaurynovich ; R Verdier ; G I Veres ; P Walters ; E Wenger ; D Willhelm ; F L H Wolfs ; B Wosiek ; K Wo?niak ; S Wyngaardt ; B Wys?ouch ;
Date:	2 Jun 2006
Journal:	Phys Rev Lett, 96 (21), 212301
Abstract:	We present transverse momentum distributions of charged hadrons produced in Cu + Cu collisions at square root of SNN = 62.4 and 200 GeV. The spectra are measured for transverse momenta of 0.25 < pT < 5.0 GeV/c at square root of SNN = 62.4 GeV and 0.25 < pT < 7.0 GeV/c at square root of SNN = 200 GeV, in a pseudorapidity range of 0.2 < eta < 1.4. The nuclear modification factor R(AA) is calculated relative to p + p data at both collision energies as a function of collision centrality. At a given collision energy and fractional cross section, R(AA) is observed to be systematically larger in Cu + Cu collisions compared to Au + Au. However, for the same number of participating nucleons, R(AA) is essentially the same in both systems over the measured range of pT, in spite of the significantly different geometries of the Cu + Cu and Au + Au systems.
Source:	PubMed, pmid16803231
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