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Title: Centrality dependence of charged hadron and strange hadron elliptic flow from {radical}(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 K{sub S}{sup 0} and {lambda}. In the relatively low p{sub T} region, p{sub T}{<=}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{<=}p{sub T}{<=}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 beenmore » observed, indicating a stronger collective flow in more central Au+Au collisions.« less

Authors:
; ; ; ; ; ; ; ;  [1]; ; ; ; ;  [2]; ; ; ; ; ;  [3]
  1. University of Illinois at Chicago, Chicago, Illinois 60607 (United States)
  2. Panjab University, Chandigarh 160014 (India)
  3. Variable Energy Cyclotron Centre, Kolkata 700064 (India)
Publication Date:
OSTI Identifier:
21190003
Resource Type:
Journal Article
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 77; Journal Issue: 5; Other Information: DOI: 10.1103/PhysRevC.77.054901; (c) 2008 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:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ATOM-ATOM COLLISIONS; BNL; BROOKHAVEN RHIC; COLLISIONS; COMPARATIVE EVALUATIONS; DATA COVARIANCES; FUNCTIONS; GEV RANGE 100-1000; HADRONS; INTERACTIONS; PARTICLES; QUARKS; SCALING; STARS; TRANSVERSE MOMENTUM

Citation Formats

Abelev, B I, Barannikova, O, Betts, R R, Callner, J, Garcia-Solis, E, Hofman, D J, Hollis, R S, Iordanova, A, Suarez, M C, Aggarwal, M M, Bhati, A K, Kumar, A, Kumar, L, Pruthi, N K, Ahammed, Z, Chattopadhyay, S, Mazumdar, M R. Dutta, Ganti, M S, Ghosh, P, and Mohanty, B. Centrality dependence of charged hadron and strange hadron elliptic flow from {radical}(s{sub NN})=200 GeV Au+Au collisions. United States: N. p., 2008. Web. doi:10.1103/PHYSREVC.77.054901.
Abelev, B I, Barannikova, O, Betts, R R, Callner, J, Garcia-Solis, E, Hofman, D J, Hollis, R S, Iordanova, A, Suarez, M C, Aggarwal, M M, Bhati, A K, Kumar, A, Kumar, L, Pruthi, N K, Ahammed, Z, Chattopadhyay, S, Mazumdar, M R. Dutta, Ganti, M S, Ghosh, P, & Mohanty, B. Centrality dependence of charged hadron and strange hadron elliptic flow from {radical}(s{sub NN})=200 GeV Au+Au collisions. United States. https://doi.org/10.1103/PHYSREVC.77.054901
Abelev, B I, Barannikova, O, Betts, R R, Callner, J, Garcia-Solis, E, Hofman, D J, Hollis, R S, Iordanova, A, Suarez, M C, Aggarwal, M M, Bhati, A K, Kumar, A, Kumar, L, Pruthi, N K, Ahammed, Z, Chattopadhyay, S, Mazumdar, M R. Dutta, Ganti, M S, Ghosh, P, and Mohanty, B. Thu . "Centrality dependence of charged hadron and strange hadron elliptic flow from {radical}(s{sub NN})=200 GeV Au+Au collisions". United States. https://doi.org/10.1103/PHYSREVC.77.054901.
@article{osti_21190003,
title = {Centrality dependence of charged hadron and strange hadron elliptic flow from {radical}(s{sub NN})=200 GeV Au+Au collisions},
author = {Abelev, B I and Barannikova, O and Betts, R R and Callner, J and Garcia-Solis, E and Hofman, D J and Hollis, R S and Iordanova, A and Suarez, M C and Aggarwal, M M and Bhati, A K and Kumar, A and Kumar, L and Pruthi, N K and Ahammed, Z and Chattopadhyay, S and Mazumdar, M R. Dutta and Ganti, M S and Ghosh, P and Mohanty, B},
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 K{sub S}{sup 0} and {lambda}. In the relatively low p{sub T} region, p{sub T}{<=}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{<=}p{sub T}{<=}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/21190003}, journal = {Physical Review. C, Nuclear Physics},
issn = {0556-2813},
number = 5,
volume = 77,
place = {United States},
year = {2008},
month = {5}
}