Charged-particle multiplicity and pseudorapidity distributions measured with the PHOBOS detector in Au+Au, Cu+Cu, d+Au, and p+p collisions at ultrarelativistic energies
Author(s)
Alver, Burak Han; Ballintijn, Maarten; Busza, Wit; Gulbrandsen, K.; Henderson, C.; Kane, J. L.; Katzy, J.; Kulinich, Piotr; Pernegger, H.; Reed, C.; Rosenberg, Leslie; Sarin, P.; Stephans, George S. F.; Vale, C.; Vaurynovich, Siarhei S.; Verdier, Robin; Veres, Gabor; Wadsworth, Bernard; Wenger, Edward Allen; Wyslouch, Boleslaw; Decowski, Michael P.; Li, W.; Loizides, Constantinos; Roland, Christof E; Roland, Gunther M; Steadman, Stephen G; van Nieuwenhuizen, Gerrit J; ... Show more Show less
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Pseudorapidity distributions of charged particles emitted in Au+Au, Cu+Cu, d+Au, and p+p collisions over a wide energy range have been measured using the PHOBOS detector at the BNL Relativistic Heavy-Ion Collider (RHIC). The centrality dependence of both the charged particle distributions and the multiplicity at midrapidity were measured. Pseudorapidity distributions of charged particles emitted with |η|<5.4 [|eta|<5.4], which account for between 95% and 99% of the total charged-particle emission associated with collision participants, are presented for different collision centralities. Both the midrapidity density dNch/dη [dN subscript ch / d eta] and the total charged-particle multiplicity Nch [N subscript ch] are found to factorize into a product of independent functions of collision energy, √sNN [square root of s subscript N N prime], and centrality given in terms of the number of nucleons participating in the collision, Npart [N subscript part]. The total charged particle multiplicity, observed in these experiments and those at lower energies, assumes a linear dependence of (lnsNN)2 [(1n s subscript NN) superscript 2] over the full range of collision energy of √sNN=2.7–200 [square root of S subscript NN + 2.7-200] GeV.
Date issued
2011-02Department
Bates Linear Accelerator Center; Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear ScienceJournal
Physical review C
Publisher
American Physical Society
Citation
Alver, B. et al. “Charged-particle multiplicity and pseudorapidity distributions measured with the PHOBOS detector in Au+Au, Cu+Cu, d+Au, and p+p collisions at ultrarelativistic energies.” Physical Review C 83.2 (2011) : n. pag. ©2011 American Physical Society
Version: Final published version
ISSN
0556-2813