CERN Accelerating science

Article
Report number	nucl-ex/0306025
Title	Centrality dependence of charged hadron transverse momentum spectra in d+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV
Author(s)	Back, B B ; Baker, M D ; Ballintijn, M ; Barton, D S ; Becker, B ; Betts, R R ; Bickley, A A ; Bindel, R ; Budzanowski, A ; Busza, W ; Carroll, A ; Decowski, M P ; García, E ; Gburek, T ; George, N ; Gulbrandsen, K H ; Gushue, S ; Halliwell, C ; Hamblen, J ; Harrington, A S ; Henderson, C ; Hofman, D J ; Hollis, R S ; Holynski, R ; Holzman, B ; Iordanova, A ; Johnson, E ; Kane, J L ; Khan, N ; Kulinich, P A ; Kuo, C M ; Lee, J W ; Lin, W T ; Manly, S ; Mignerey, A C ; Nöll, A ; Nouicer, R ; Olszewski, A ; Pak, R ; Park, I C ; Pernegger, H ; Reed, C ; Remsberg, L P ; Roland, C ; Roland, G ; Sagerer, J ; Sarin, P ; Sawicki, P ; Sedykh, I ; Skulski, W ; Smith, C E ; Steinberg, P ; Stephans, G S F ; Sukhanov, A ; Teng, R ; Tonjes, M B ; Trzupek, A ; Vale, C ; van Nieuwenhuizen, G J ; Verdier, R ; Veres, G I ; Wadsworth, B ; Wolfs, F L H ; Wosiek, B ; Wozniak, K ; Wuosmaa, A H ; Wyslouch, B ; Zhang, J
Publication	2003
Imprint	18 Jun 2003
Number of pages	5
In:	Phys. Rev. Lett. 91 (2003) 072302
DOI	10.1103/PhysRevLett.91.072302
Subject category	Nuclear Physics - Experiment
Abstract	We have measured transverse momentum distributions of charged hadrons produced in d+Au collisions at sqrt(s_NN) = 200 GeV. The spectra were obtained for transverse momenta 0.25 < p_T < 6.0 GeV/c, in a pseudorapidity range of 0.2 < eta < 1.4 in the deuteron direction. The evolution of the spectra with collision centrality is presented in comparison to p+pbarcollisions at the same collision energy. With increasing centrality, the yield at high transverse momenta increases more rapidly than the overall particle density, leading to a strong modification of the spectral shape. This change in spectral shape is qualitatively different from observations in Au+Au collisions at the same energy. The results provide important information for discriminating between different models for the suppression of high-p_T hadrons observed in Au+Au collisions.

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