Azimuthal Harmonics in Small and Large Collision Systems at RHIC Top Energies - INSPIRE

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Azimuthal Harmonics in Small and Large Collision Systems at RHIC Top Energies

STAR

Collaboration

•

Jaroslav Adam
(
- Creighton U.
)

Jan 23, 2019

8 pages

Published in:

Phys.Rev.Lett. 122 (2019) 17, 172301

Published: May 1, 2019

e-Print:

1901.08155 [nucl-ex]

DOI:

10.1103/PhysRevLett.122.172301

Experiments:

BNL-RHIC-STAR

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Abstract: (APS)

The first (v1fluc), second (v2), and third (v3) harmonic coefficients of the azimuthal particle distribution at midrapidity are extracted for charged hadrons and studied as a function of transverse momentum (pT) and mean charged particle multiplicity density ⟨Nch⟩ in U+U (sNN=193 GeV), Au+Au, Cu+Au, Cu+Cu, d+Au, and p+Au collisions at sNN=200 GeV with the STAR detector. For the same ⟨Nch⟩, the v1fluc and v3 coefficients are observed to be independent of the collision system, while v2 exhibits such a scaling only when normalized by the initial-state eccentricity (ϵ2). The data also show that ln(v2/ϵ2) scales linearly with ⟨Nch⟩-1/3. These measurements provide insight into initial-geometry fluctuations and the role of viscous hydrodynamic attenuation on vn from small to large collision systems.

25.75.-q
25.75.Gz
25.75.Ld
Nuclear Physics
charged particle: multiplicity
hydrodynamics: viscosity
multiplicity: density
Brookhaven RHIC Coll
transverse momentum
initial state

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Figures(4)

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