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Title: Similarity of Initial States in A+A and p+p Collisions in Constituent Quarks Framework

Abstract

The multiparticle production results from A+A and p(p-bar)+p collisions have been compared based on the number of nucleon participants and the number of constituent quark (parton) participants. In both normalizations, we observe that the charged particle densities in Au+Au and Cu+Cu collisions are similar for both {radical}(s{sub NN}) = 62.4 and 200 GeV. This implies that in symmetric nucleus-nucleus collisions the charged particle density does not depend on the size of the two colliding nuclei but only on the collision energy. In the nucleon participants framework, the particle density at mid-rapidity as well as in the limiting fragmentation region from A+A collisions are higher than those of p(p-bar)+p collisions at the same energy. Also the integrated total charged particle in A+A collisions as a function of number nucleon participants is higher than p(p-bar)+p collisions at the same energy indicating that there is no smooth transition between peripheral A+A and nucleon-nucleon collisions. However, when the comparison is made in the constituent quarks framework, A+A and p(p-bar)+p collisions exhibit a striking degree of agreement. The observations presented in this paper imply that the number of constituent quark pairs participating in the collision controls the particle production. One may therefore conjecture that themore » initial states A+A and p+p collisions are similar when the partonic considerations are used in normalization. Another interesting result is that there is an overall factorization of dNch/d{eta} shapes as a function of collision centrality between Au+Au and Cu+Cu collisions at the same energy, {radical}(s{sub NN}) = 200 GeV.« less

Authors:
 [1]
  1. Chemistry Department, Brookhaven National Laboratory, Upton, NY 11973-5000 (United States)
Publication Date:
OSTI Identifier:
20800066
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 828; Journal Issue: 1; Conference: 35. internationals symposium on multiparticle dynamics; Workshop on particle correlations and femtoscopy, Kromeriz (Czech Republic), 9-17 Aug 2005; Other Information: DOI: 10.1063/1.2197388; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; COMPARATIVE EVALUATIONS; COPPER 63 REACTIONS; COPPER 63 TARGET; DENSITY; FACTORIZATION; GEV RANGE; GOLD 197 REACTIONS; GOLD 197 TARGET; LIMITING FRAGMENTATION; PARTICLE PRODUCTION; PARTICLE RAPIDITY; PROTON-ANTIPROTON INTERACTIONS; PROTON-PROTON INTERACTIONS; QUARK MODEL; QUARKS

Citation Formats

Nouicer, Rachid. Similarity of Initial States in A+A and p+p Collisions in Constituent Quarks Framework. United States: N. p., 2006. Web. doi:10.1063/1.2197388.
Nouicer, Rachid. Similarity of Initial States in A+A and p+p Collisions in Constituent Quarks Framework. United States. doi:10.1063/1.2197388.
Nouicer, Rachid. Tue . "Similarity of Initial States in A+A and p+p Collisions in Constituent Quarks Framework". United States. doi:10.1063/1.2197388.
@article{osti_20800066,
title = {Similarity of Initial States in A+A and p+p Collisions in Constituent Quarks Framework},
author = {Nouicer, Rachid},
abstractNote = {The multiparticle production results from A+A and p(p-bar)+p collisions have been compared based on the number of nucleon participants and the number of constituent quark (parton) participants. In both normalizations, we observe that the charged particle densities in Au+Au and Cu+Cu collisions are similar for both {radical}(s{sub NN}) = 62.4 and 200 GeV. This implies that in symmetric nucleus-nucleus collisions the charged particle density does not depend on the size of the two colliding nuclei but only on the collision energy. In the nucleon participants framework, the particle density at mid-rapidity as well as in the limiting fragmentation region from A+A collisions are higher than those of p(p-bar)+p collisions at the same energy. Also the integrated total charged particle in A+A collisions as a function of number nucleon participants is higher than p(p-bar)+p collisions at the same energy indicating that there is no smooth transition between peripheral A+A and nucleon-nucleon collisions. However, when the comparison is made in the constituent quarks framework, A+A and p(p-bar)+p collisions exhibit a striking degree of agreement. The observations presented in this paper imply that the number of constituent quark pairs participating in the collision controls the particle production. One may therefore conjecture that the initial states A+A and p+p collisions are similar when the partonic considerations are used in normalization. Another interesting result is that there is an overall factorization of dNch/d{eta} shapes as a function of collision centrality between Au+Au and Cu+Cu collisions at the same energy, {radical}(s{sub NN}) = 200 GeV.},
doi = {10.1063/1.2197388},
journal = {AIP Conference Proceedings},
number = 1,
volume = 828,
place = {United States},
year = {Tue Apr 11 00:00:00 EDT 2006},
month = {Tue Apr 11 00:00:00 EDT 2006}
}