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Title: Centrality dependence of charged hadron and strange hadron elliptic flow from {radical}{ovr s} {sub NN} =200 GeV Au+Au collisions.

Abstract

We present STAR results on the elliptic flow v{sub 2} of charged hadrons, strange and multistrange particles from {radical}s{sub NN} = 200 GeV Au+Au collisions at the BNL Relativistic Heavy Ion Collider (RHIC). The detailed study of the centrality dependence of v{sub 2} over a broad transverse momentum range is presented. Comparisons of different analysis methods are made in order to estimate systematic uncertainties. To discuss the nonflow effect, we have performed the first analysis of v{sub 2} with the Lee-Yang zero method for KS{sup 0} and {Lambda}. In the relatively low p{sub T} region, p{sub T} {le} 2 GeV/c, a scaling with m{sub T}-m is observed for identified hadrons in each centrality bin studied. However, we do not observe v{sub 2}(p{sub T}) scaled by the participant eccentricity to be independent of centrality. At higher p{sub T},2 {le} p{sub T} {le} 6 GeV/c,v{sub 2} scales with quark number for all hadrons studied. For the multistrange hadron {Omega}, which does not suffer appreciable hadronic interactions, the values of v{sub 2} are consistent with both m{sub T}-m scaling at low p{sub T} and number-of-quark scaling at intermediate p{sub T}. As a function of collision centrality, an increase of p{sub T}-integrated v{sub 2}more » scaled by the participant eccentricity has been observed, indicating a stronger collective flow in more central Au+Au collisions.« less

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC); Swiss NSF
OSTI Identifier:
963642
Report Number(s):
ANL-HEP-PR-09-78
Journal ID: ISSN 0556-2813; PRVCAN; TRN: US0903229
DOE Contract Number:  
DE-AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Phys. Rev. C
Additional Journal Information:
Journal Volume: 77; Journal Issue: 2008; Journal ID: ISSN 0556-2813
Country of Publication:
United States
Language:
ENGLISH
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 74 ATOMIC AND MOLECULAR PHYSICS; BNL; HADRONS; HEAVY IONS; QUARKS; TRANSVERSE MOMENTUM

Citation Formats

Abelev, B I, Aggarwal, M M, Ahammed, Z, Anderson, B D, Arkhipkin, D, Krueger, K, Spinka, H M, Underwood, D G, High Energy Physics, Univ. of Illinois, Panjab Univ., Variable Energy Cyclotron, Kent State Univ., Particle Physic Lab., and STAR Collaboration. Centrality dependence of charged hadron and strange hadron elliptic flow from {radical}{ovr s} {sub NN} =200 GeV Au+Au collisions.. United States: N. p., 2008. Web. doi:10.1103/PhysRevC.77.054901.
Abelev, B I, Aggarwal, M M, Ahammed, Z, Anderson, B D, Arkhipkin, D, Krueger, K, Spinka, H M, Underwood, D G, High Energy Physics, Univ. of Illinois, Panjab Univ., Variable Energy Cyclotron, Kent State Univ., Particle Physic Lab., & STAR Collaboration. Centrality dependence of charged hadron and strange hadron elliptic flow from {radical}{ovr s} {sub NN} =200 GeV Au+Au collisions.. United States. https://doi.org/10.1103/PhysRevC.77.054901
Abelev, B I, Aggarwal, M M, Ahammed, Z, Anderson, B D, Arkhipkin, D, Krueger, K, Spinka, H M, Underwood, D G, High Energy Physics, Univ. of Illinois, Panjab Univ., Variable Energy Cyclotron, Kent State Univ., Particle Physic Lab., and STAR Collaboration. Tue . "Centrality dependence of charged hadron and strange hadron elliptic flow from {radical}{ovr s} {sub NN} =200 GeV Au+Au collisions.". United States. https://doi.org/10.1103/PhysRevC.77.054901.
@article{osti_963642,
title = {Centrality dependence of charged hadron and strange hadron elliptic flow from {radical}{ovr s} {sub NN} =200 GeV Au+Au collisions.},
author = {Abelev, B I and Aggarwal, M M and Ahammed, Z and Anderson, B D and Arkhipkin, D and Krueger, K and Spinka, H M and Underwood, D G and High Energy Physics and Univ. of Illinois and Panjab Univ. and Variable Energy Cyclotron and Kent State Univ. and Particle Physic Lab. and STAR Collaboration},
abstractNote = {We present STAR results on the elliptic flow v{sub 2} of charged hadrons, strange and multistrange particles from {radical}s{sub NN} = 200 GeV Au+Au collisions at the BNL Relativistic Heavy Ion Collider (RHIC). The detailed study of the centrality dependence of v{sub 2} over a broad transverse momentum range is presented. Comparisons of different analysis methods are made in order to estimate systematic uncertainties. To discuss the nonflow effect, we have performed the first analysis of v{sub 2} with the Lee-Yang zero method for KS{sup 0} and {Lambda}. In the relatively low p{sub T} region, p{sub T} {le} 2 GeV/c, a scaling with m{sub T}-m is observed for identified hadrons in each centrality bin studied. However, we do not observe v{sub 2}(p{sub T}) scaled by the participant eccentricity to be independent of centrality. At higher p{sub T},2 {le} p{sub T} {le} 6 GeV/c,v{sub 2} scales with quark number for all hadrons studied. For the multistrange hadron {Omega}, which does not suffer appreciable hadronic interactions, the values of v{sub 2} are consistent with both m{sub T}-m scaling at low p{sub T} and number-of-quark scaling at intermediate p{sub T}. As a function of collision centrality, an increase of p{sub T}-integrated v{sub 2} scaled by the participant eccentricity has been observed, indicating a stronger collective flow in more central Au+Au collisions.},
doi = {10.1103/PhysRevC.77.054901},
url = {https://www.osti.gov/biblio/963642}, journal = {Phys. Rev. C},
issn = {0556-2813},
number = 2008,
volume = 77,
place = {United States},
year = {2008},
month = {1}
}