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

Journal Article · · Physical Review. C. Nuclear Physics
 [1]
  1. Univ. of Colorado, Boulder, CO (United States). et al.
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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. 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.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC); USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Contributing Organization:
PHENIX Collaboration
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1226055
Report Number(s):
BNL-108444-2015-JA; KB201021
Journal Information:
Physical Review. C. Nuclear Physics, Journal Name: Physical Review. C. Nuclear Physics Journal Issue: 3 Vol. 92; ISSN 0556-2813; ISSN PRVCAN
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Linearized Boltzmann transport model for jet propagation in the quark-gluon plasma: Heavy quark evolution journal July 2016
Measurements of directed, elliptic, and triangular flow in Cu + Au collisions at s NN = 200 GeV journal November 2016
Measurements of jet quenching with semi-inclusive hadron+jet distributions in Au + Au collisions at s N N = 200 GeV journal August 2017
Azimuthal anisotropy in Cu+Au collisions at s NN = 200 GeV journal July 2018

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
Cu+Cu and Au+Au
RHIC
Relativistic Heavy Ion Collider
anisotropy
azimuthal
collisions