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Title: System size, energy and centrality dependence of strange hadron elliptic flow at STAR

Abstract

The elliptic flow (v{sub 2}) pattern in terms of hadron mass and transverse momentum p{sub T} is qualitatively described for p{sub T} < 2 GeV/c by ideal hydrodynamics in Au + Au collisions at RHIC. In addition, for p{sub T} = 2-6 GeV/c the measured v{sub 2} follow a universal scaling by the number of quarks explained by quark coalescence/recombination models. These observations suggest that a partonic collectivity develops in the matter in early stage of heavy ion collisions. Centrality as well as system size and energy dependence of the v{sub 2} is important to shed light on the underlying collision dynamics in heavy ion collisions. We present the measurements of centrality dependence of v{sub 2} at {radical}s{sub NN} = 200 and 62.4 GeV in Au + Au and Cu + Cu collisions for K{sub S}{sup 0}, {phi}, {Lambda}, {Xi} and {Omega} at STAR experiment. We focus on the recent Cu + Cu results and discuss the centrality dependence of v{sub 2} as well as the number of quark scaling as a function of transverse kinetic energy at different system size and energies. We also discuss the eccentricity scaled v{sub 2} for identified hadrons and implications that ideal hydrodynamical limitmore » has not been reached at RHIC.« less

Authors:
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
Nuclear Science Division
OSTI Identifier:
965893
Report Number(s):
LBNL-2212E
Journal ID: ISSN 0954-3899; JPGPED; TRN: US0903897
DOE Contract Number:  
DE-AC02-05CH11231
Resource Type:
Journal Article
Journal Name:
Journal of Physics G: Nucl. Part. Phys. 36
Additional Journal Information:
Journal Volume: 36; Journal ID: ISSN 0954-3899
Country of Publication:
United States
Language:
English
Subject:
73; ENERGY DEPENDENCE; HADRONS; HEAVY IONS; HYDRODYNAMICS; KINETIC ENERGY; QUARKS; TRANSVERSE MOMENTUM

Citation Formats

Masui, Hiroshi. System size, energy and centrality dependence of strange hadron elliptic flow at STAR. United States: N. p., 2008. Web.
Masui, Hiroshi. System size, energy and centrality dependence of strange hadron elliptic flow at STAR. United States.
Masui, Hiroshi. Sun . "System size, energy and centrality dependence of strange hadron elliptic flow at STAR". United States. https://www.osti.gov/servlets/purl/965893.
@article{osti_965893,
title = {System size, energy and centrality dependence of strange hadron elliptic flow at STAR},
author = {Masui, Hiroshi},
abstractNote = {The elliptic flow (v{sub 2}) pattern in terms of hadron mass and transverse momentum p{sub T} is qualitatively described for p{sub T} < 2 GeV/c by ideal hydrodynamics in Au + Au collisions at RHIC. In addition, for p{sub T} = 2-6 GeV/c the measured v{sub 2} follow a universal scaling by the number of quarks explained by quark coalescence/recombination models. These observations suggest that a partonic collectivity develops in the matter in early stage of heavy ion collisions. Centrality as well as system size and energy dependence of the v{sub 2} is important to shed light on the underlying collision dynamics in heavy ion collisions. We present the measurements of centrality dependence of v{sub 2} at {radical}s{sub NN} = 200 and 62.4 GeV in Au + Au and Cu + Cu collisions for K{sub S}{sup 0}, {phi}, {Lambda}, {Xi} and {Omega} at STAR experiment. We focus on the recent Cu + Cu results and discuss the centrality dependence of v{sub 2} as well as the number of quark scaling as a function of transverse kinetic energy at different system size and energies. We also discuss the eccentricity scaled v{sub 2} for identified hadrons and implications that ideal hydrodynamical limit has not been reached at RHIC.},
doi = {},
url = {https://www.osti.gov/biblio/965893}, journal = {Journal of Physics G: Nucl. Part. Phys. 36},
issn = {0954-3899},
number = ,
volume = 36,
place = {United States},
year = {2008},
month = {12}
}