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

Adare, A.

doi:10.1103/PhysRevC.92.034913

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

Journal Article · 23 September 2015 · Physical Review. C. Nuclear Physics

DOI: https://doi.org/10.1103/PhysRevC.92.034913 · OSTI ID:1226055

Adare, A. ^[1]

Univ. of Colorado, Boulder, CO (United States). et al.

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 √s_NN=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, N_part. We observe that v₂ divided by eccentricity (ε) monotonically increases with N_part and scales as N^1/3_part. 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 KE_T=m_T–m between 0.1_T/n_q<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/(n_q∙ε∙N^1/3_part) vs KE_T/n_q for all measured particles.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Nuclear Physics (NP)

Contributing Organization:: PHENIX Collaboration

Grant/Contract Number:: SC00112704; AC05-00OR22725

OSTI ID:: 1226055

Alternate ID(s):: OSTI ID: 1224623; OSTI ID: 1324142

Report Number(s):: BNL-108444-2015-JA; PRVCAN; KB201021

Journal Information:: Physical Review. C. Nuclear Physics, Vol. 92, Issue 3; ISSN 0556-2813

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 20 works

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

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