Centrality dependence of strangeness enhancement in ultrarelativistic heavy ion collisions: A core-corona effect
Abstract
In ultrarelativistic heavy ion collisions, the multiplicity of multistrange baryons per participating nucleon increases with centrality in a different fashion for different systems and energies. At RHIC, for copper+copper (CuCu) collisions the increase is much steeper than for gold-gold (AuAu) collisions. We show that this system size dependence is due to a core-corona effect: the relative importance of the corona as compared to the core (thermalized matter) contribution varies and the contribution of a corona nucleon to the multiplicity differs from that of a core nucleon. {phi} mesons follow--as all hadrons--the same trend, but the difference between core and corona multiplicity is relatively small, and therefore the CuCu and AuAu results are quite similar. This simple geometrical explanation makes also a strong case in favor of the validity of Glauber geometry in the peripheral regions of ultrarelativistic heavy ion collisions, which is crucial for understanding the early evolution of the system.
- Authors:
-
- SUBATECH, Laboratoire de Physique Subatomique et des Technologies Associees, Universite de Nantes, IN2P3/CNRS, Ecole des Mines de Nantes, 4 rue Alfred Kastler, F-44072 Nantes, Cedex 03 (France)
- Publication Date:
- OSTI Identifier:
- 21289940
- Resource Type:
- Journal Article
- Journal Name:
- Physical Review. C, Nuclear Physics
- Additional Journal Information:
- Journal Volume: 79; Journal Issue: 6; Other Information: DOI: 10.1103/PhysRevC.79.064907; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ATOM-ATOM COLLISIONS; BROOKHAVEN RHIC; COLLISIONS; COPPER; GOLD; HEAVY ION REACTIONS; MULTIPLICITY; NUCLEONS; PHI MESONS; RELATIVISTIC RANGE; STRANGENESS
Citation Formats
Aichelin, J, and Werner, K. Centrality dependence of strangeness enhancement in ultrarelativistic heavy ion collisions: A core-corona effect. United States: N. p., 2009.
Web. doi:10.1103/PHYSREVC.79.064907.
Aichelin, J, & Werner, K. Centrality dependence of strangeness enhancement in ultrarelativistic heavy ion collisions: A core-corona effect. United States. https://doi.org/10.1103/PHYSREVC.79.064907
Aichelin, J, and Werner, K. 2009.
"Centrality dependence of strangeness enhancement in ultrarelativistic heavy ion collisions: A core-corona effect". United States. https://doi.org/10.1103/PHYSREVC.79.064907.
@article{osti_21289940,
title = {Centrality dependence of strangeness enhancement in ultrarelativistic heavy ion collisions: A core-corona effect},
author = {Aichelin, J and Werner, K},
abstractNote = {In ultrarelativistic heavy ion collisions, the multiplicity of multistrange baryons per participating nucleon increases with centrality in a different fashion for different systems and energies. At RHIC, for copper+copper (CuCu) collisions the increase is much steeper than for gold-gold (AuAu) collisions. We show that this system size dependence is due to a core-corona effect: the relative importance of the corona as compared to the core (thermalized matter) contribution varies and the contribution of a corona nucleon to the multiplicity differs from that of a core nucleon. {phi} mesons follow--as all hadrons--the same trend, but the difference between core and corona multiplicity is relatively small, and therefore the CuCu and AuAu results are quite similar. This simple geometrical explanation makes also a strong case in favor of the validity of Glauber geometry in the peripheral regions of ultrarelativistic heavy ion collisions, which is crucial for understanding the early evolution of the system.},
doi = {10.1103/PHYSREVC.79.064907},
url = {https://www.osti.gov/biblio/21289940},
journal = {Physical Review. C, Nuclear Physics},
issn = {0556-2813},
number = 6,
volume = 79,
place = {United States},
year = {Mon Jun 15 00:00:00 EDT 2009},
month = {Mon Jun 15 00:00:00 EDT 2009}
}