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

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

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 mu...

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Bibliographic Details
Main Authors: 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
Other Authors: Bates Linear Accelerator Center
Format: Article
Language:en_US
Published: American Physical Society 2011
Online Access:http://hdl.handle.net/1721.1/63166
https://orcid.org/0000-0002-3831-9071
https://orcid.org/0000-0003-3106-4894
https://orcid.org/0000-0001-8983-2169
https://orcid.org/0000-0003-3681-0649
https://orcid.org/0000-0002-4918-5128
Description
Summary: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.

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