Azimuthal anisotropy in U$+$U and Au$+$Au collisions at RHIC - INSPIRE

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Azimuthal anisotropy in U $+$ U and Au $+$ Au collisions at RHIC

STAR

Collaboration

May 28, 2015

7 pages

Published in:

Phys.Rev.Lett. 115 (2015) 22, 222301

Published: Nov 24, 2015

e-Print:

1505.07812 [nucl-ex]

DOI:

10.1103/PhysRevLett.115.222301

Experiments:

BNL-RHIC-STAR

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Abstract: (APS)

Collisions between prolate uranium nuclei are used to study how particle production and azimuthal anisotropies depend on initial geometry in heavy-ion collisions. We report the two- and four-particle cumulants, v2{2} and v2{4}, for charged hadrons from U+U collisions at sNN=193 GeV and Au+Au collisions at sNN=200 GeV. Nearly fully overlapping collisions are selected based on the energy deposited by spectators in zero degree calorimeters (ZDCs). Within this sample, the observed dependence of v2{2} on multiplicity demonstrates that ZDC information combined with multiplicity can preferentially select different overlap configurations in U+U collisions. We also show that v2 vs multiplicity can be better described by models, such as gluon saturation or quark participant models, that eliminate the dependence of the multiplicity on the number of binary nucleon-nucleon collisions.

Note:

Final paper version accepted for publication in Phys. Rev. Lett. New version includes comparisons to a constituent quark glauber model

25.75.-q
25.75.Ag
25.75.Ld
angular distribution: anisotropy
harmonic
gluon: saturation
calorimeter: forward spectrometer
heavy ion: scattering
multiplicity
Brookhaven RHIC Coll

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Figures(4)

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