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Title: Systematic study of azimuthal anisotropy in Cu + Cu and Au + Au collisions at √sNN = 62.4 and 200 GeV

Abstract

In this paper, we have studied the dependence of azimuthal anisotropy v2 for inclusive and identified charged hadrons in Au+Au and Cu+Cu collisions on collision energy, species, and centrality. The values of v2 as a function of transverse momentum pT and centrality in Au+Au collisions at √sNN=200 and 62.4 GeV are the same within uncertainties. However, in Cu+Cu collisions we observe a decrease in v2 values as the collision energy is reduced from 200 to 62.4 GeV. The decrease is larger in the more peripheral collisions. By examining both Au+Au and Cu+Cu collisions we find that v2 depends both on eccentricity and the number of participants, Npart. We observe that v2 divided by eccentricity (ε) monotonically increases with Npart and scales as N1/3part. Thus, the Cu+Cu data at 62.4 GeV falls below the other scaled v2 data. For identified hadrons, v2 divided by the number of constituent quarks nq is independent of hadron species as a function of transverse kinetic energy KET=mT–m between 0.1T/nq<1 GeV. Finally, combining all of the above scaling and normalizations, we observe a near-universal scaling, with the exception of the Cu+Cu data at 62.4 GeV, of v2/(nq∙ε∙N1/3part) vs KET/nq for all measured particles.

Authors:
 [1]
  1. Univ. of Colorado, Boulder, CO (United States). et al.
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP)
Contributing Org.:
PHENIX Collaboration
OSTI Identifier:
1226055
Alternate Identifier(s):
OSTI ID: 1224623; OSTI ID: 1324142
Report Number(s):
BNL-108444-2015-JA
Journal ID: ISSN 0556-2813; PRVCAN; KB201021
Grant/Contract Number:  
SC00112704; AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review. C. Nuclear Physics
Additional Journal Information:
Journal Volume: 92; Journal Issue: 3; Journal ID: ISSN 0556-2813
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; RHIC; azimuthal; anisotropy; Cu+Cu and Au+Au; collisions; Relativistic Heavy Ion Collider

Citation Formats

Adare, A. Systematic study of azimuthal anisotropy in Cu + Cu and Au + Au collisions at √sNN = 62.4 and 200 GeV. United States: N. p., 2015. Web. doi:10.1103/PhysRevC.92.034913.
Adare, A. Systematic study of azimuthal anisotropy in Cu + Cu and Au + Au collisions at √sNN = 62.4 and 200 GeV. United States. https://doi.org/10.1103/PhysRevC.92.034913
Adare, A. 2015. "Systematic study of azimuthal anisotropy in Cu + Cu and Au + Au collisions at √sNN = 62.4 and 200 GeV". United States. https://doi.org/10.1103/PhysRevC.92.034913. https://www.osti.gov/servlets/purl/1226055.
@article{osti_1226055,
title = {Systematic study of azimuthal anisotropy in Cu + Cu and Au + Au collisions at √sNN = 62.4 and 200 GeV},
author = {Adare, A.},
abstractNote = {In this paper, we have studied the dependence of azimuthal anisotropy v2 for inclusive and identified charged hadrons in Au+Au and Cu+Cu collisions on collision energy, species, and centrality. The values of v2 as a function of transverse momentum pT and centrality in Au+Au collisions at √sNN=200 and 62.4 GeV are the same within uncertainties. However, in Cu+Cu collisions we observe a decrease in v2 values as the collision energy is reduced from 200 to 62.4 GeV. The decrease is larger in the more peripheral collisions. By examining both Au+Au and Cu+Cu collisions we find that v2 depends both on eccentricity and the number of participants, Npart. We observe that v2 divided by eccentricity (ε) monotonically increases with Npart and scales as N1/3part. Thus, the Cu+Cu data at 62.4 GeV falls below the other scaled v2 data. For identified hadrons, v2 divided by the number of constituent quarks nq is independent of hadron species as a function of transverse kinetic energy KET=mT–m between 0.1T/nq<1 GeV. Finally, combining all of the above scaling and normalizations, we observe a near-universal scaling, with the exception of the Cu+Cu data at 62.4 GeV, of v2/(nq∙ε∙N1/3part) vs KET/nq for all measured particles.},
doi = {10.1103/PhysRevC.92.034913},
url = {https://www.osti.gov/biblio/1226055}, journal = {Physical Review. C. Nuclear Physics},
issn = {0556-2813},
number = 3,
volume = 92,
place = {United States},
year = {Wed Sep 23 00:00:00 EDT 2015},
month = {Wed Sep 23 00:00:00 EDT 2015}
}

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Cited by: 20 works
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Works referenced in this record:

PHENIX calorimeter
journal, March 2003

  • Aphecetche, L.; Awes, T. C.; Banning, J.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 499, Issue 2-3
  • https://doi.org/10.1016/S0168-9002(02)01954-X

Elliptic and Hexadecapole Flow of Charged Hadrons in Au + Au Collisions at s N N = 200 GeV
journal, August 2010


Quark–gluon plasma and color glass condensate at RHIC? The perspective from the BRAHMS experiment
journal, August 2005


Jet structure from dihadron correlations in d + Au collisions at s NN = 200 GeV
journal, May 2006


Collective Flow and Viscosity in Relativistic Heavy-Ion Collisions
journal, October 2013


Observation of long-range, near-side angular correlations in pPb collisions at the LHC
journal, January 2013


Charged Kaon Interferometric Probes of Space-Time Evolution in Au + Au Collisions at s NN = 200 GeV
journal, September 2009


Charged and strange hadron elliptic flow in Cu + Cu collisions at s NN = 62.4 and 200 GeV
journal, April 2010


The PHOBOS perspective on discoveries at RHIC
journal, August 2005


Anisotropic flow in ultra-relativistic heavy-ion collisions
journal, February 2002


High- p_{T} charged hadron suppression in Au+Au collisions at sqrt[s_{NN}]=200GeV
journal, March 2004


Elliptic Flow of Identified Hadrons in A u + A u Collisions at s N N = 200 G e V
journal, October 2003


Anisotropic flow of charged hadrons, pions and (anti-)protons measured at high transverse momentum in Pb–Pb collisions at <mml:math altimg="si1.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:msqrt><mml:msub><mml:mrow><mml:mi>s</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="normal">NN</mml:mi></mml:mrow></mml:msub></mml:msqrt><mml:mo>=</mml:mo><mml:mn>2.76</mml:mn><mml:mtext> TeV</mml:mtext></mml:math>
journal, February 2013


Elliptic flow of identified hadrons in Au+Au collisions at s NN = 7.7 –62.4 GeV
journal, July 2013


Quadrupole Anisotropy in Dihadron Azimuthal Correlations in Central d + Au Collisions at s N N = 200 GeV
journal, November 2013


Hints of incomplete thermalization in RHIC data
journal, July 2006


PHENIX central arm particle ID detectors
journal, March 2003

  • Aizawa, M.; Akiba, Y.; Begay, R.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 499, Issue 2-3
  • https://doi.org/10.1016/S0168-9002(02)01953-8

Measurement of the elliptic anisotropy of charged particles produced in PbPb collisions at s N N = 2.76 TeV
journal, January 2013


Glauber Modeling in High-Energy Nuclear Collisions
journal, November 2007


PHENIX detector overview
journal, March 2003

  • Adcox, K.; Adler, S. S.; Aizama, M.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 499, Issue 2-3
  • https://doi.org/10.1016/S0168-9002(02)01950-2

Observation of long-range, near-side angular correlations in proton-proton collisions at the LHC
journal, September 2010


Event reconstruction in the PHENIX central arm spectrometers
journal, April 2002

  • Mitchell, J. T.; Akiba, Y.; Aphecetche, L.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 482, Issue 1-2
  • https://doi.org/10.1016/S0168-9002(01)01512-1

Scaling Properties of Azimuthal Anisotropy in Au + Au and Cu + Cu Collisions at s NN = 200 GeV
journal, April 2007


Construction and performance of the PHENIX pad chambers
journal, February 2003

  • Adcox, K.; Ajitanand, J.; Alexander, J.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 497, Issue 2-3
  • https://doi.org/10.1016/S0168-9002(02)01791-6

Elliptic Flow and Nuclear Modification Factor in Ultrarelativistic Heavy-Ion Collisions within a Partonic Transport Model
journal, March 2015


Methods for analyzing anisotropic flow in relativistic nuclear collisions
journal, September 1998


Systematic studies of elliptic flow measurements in Au + Au collisions at s NN = 200 GeV
journal, August 2009


Elliptic flow from two- and four-particle correlations in Au+Au collisions at s NN = 130 GeV
journal, September 2002


System Size, Energy, Pseudorapidity, and Centrality Dependence of Elliptic Flow
journal, June 2007


Charged-Particle Multiplicity Density at Midrapidity in Central Pb-Pb Collisions at s N N = 2.76 TeV
journal, December 2010


Anisotropy as a signature of transverse collective flow
journal, July 1992


Elliptic flow of identified hadrons in Pb-Pb collisions at s N N = 2.76 $$ \sqrt{s_{\mathrm{NN}}}=2.76 $$ TeV
journal, June 2015