Document Type

Article

Publication Date

2012

DOI

10.1103/PhysRevC.86.014904

Publication Title

Physical Review C

Volume

86

Issue

1

Pages

014904 (1-15)

Abstract

We present STAR measurements of azimuthal anisotropy by means of the two- and four-particle cumulants ν2 ν2{2} and ν2{4}) for Au + Au and Cu + Cu collisions at center-of-mass energies √ˢᴺᴺ = 62.4 and 200 GeV. The difference between ν2{2}2 and ν2{4}2 is related to ν2fluctuations (σν2) and nonflow (δ2). We present an upper limit to σν2/ν2. Following the assumption that eccentricity fluctuations σε dominate ν2 fluctuations σν2/ν2 ≈ σε/ε we deduce the nonflow implied for several models of eccentricity fluctuations that would be required for consistency with ν2{2} and ν2{4}. We also present results on the ratio of ν2 to eccentricity.

Comments

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Original Publication Citation

Agakishiev, G., Aggarwal, M. M., Ahammed, Z., Alakhverdyants, A. V., Alekseev, I., Alford, J., . . . Zoulkarneeva, Y. (2012). Energy and system size dependence of two- and four-particle ν2 measurements in heavy-ion collisions at √ˢᴺᴺ = 62.4 and 200 GeV and their implications on flow fluctuations and nonflow. Physical Review C, 86(1), 014904. doi:10.1103/PhysRevC.86.014904

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