Energy and system-size dependence of two- and four-particle v[subscript 2] measurements in heavy-ion collisions at [radical over s[subscript NN]]=62.4 and 200 GeV and their implications on flow fluctuations and nonflow
Name
Agakishiev-2012-Energy and system-size dependence of two- and four-particle.pdf
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1.2 MB
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Checksum (MD5)
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Author(s)
Balewski, Jan T.
Betancourt, Michael Joseph
Corliss, Ross Cameron
Hays-Wehle, James Prewitt
Leight, William Axel
Milner, Richard G.
Redwine, Robert P.
Seele, J.
Walker, M.
van Nieuwenhuizen, Gerrit Jan
Date Issued
July 2012
Journal
Physical Review C
Publisher
American Physical Society
Citation
Agakishiev, G. et al. “Energy and System-size Dependence of Two- and Four-particle V_{2} Measurements in Heavy-ion Collisions at sqrt[s_{NN}]=62.4 and 200 GeV and Their Implications on Flow Fluctuations and Nonflow.” Physical Review C 86.1 (2012). ©2012 American Physical Society
Version
Final published version
Abstract
We present STAR measurements of azimuthal anisotropy by means of the two- and four-particle cumulants v[subscript 2] (v[subscript 2]{2} and v[subscript 2]{4}) for Au+Au and Cu+Cu collisions at center-of-mass energies [radical over s[subscript NN]]=62.4 and 200 GeV. The difference between v[subscript 2]{2}[superscript 2] and v[subscript 2]{4}[superscript 2] is related to v[subscript 2] fluctuations (σ[subscript v2]) and nonflow (δ[subscript 2]). We present an upper limit to σ[subscript v2]/v[subscript 2]. Following the assumption that eccentricity fluctuations σɛ dominate v[subscript 2] fluctuations σ[subscript v2]/v[subscript 2]≈σ[subscript ɛ]/ɛ we deduce the nonflow implied for several models of eccentricity fluctuations that would be required for consistency with v[subscript 2]{2} and v[subscript 2]{4}. We also present results on the ratio of v[subscript 2] to eccentricity.
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevC.86.014904
