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

STAR Collaboration

doi:10.1103/PhysRevLett.122.172301

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

STAR Collaboration

Creighton University
AGH University of Krakow
Ohio State University
University of Kentucky
Kent State University
Joint Institute for Nuclear Research
Panjab University
Variable Energy Cyclotron Centre
Alikhanov Institute for Theoretical and Experimental Physics
Moscow Engineering Physics Institute
Texas A&M University
University of Tsukuba
Brookhaven National Laboratory
Tsinghua University
Central China Normal University
National Institute of Science Education and Research
University of California at Riverside
Stony Brook University
University of Houston
University of Jammu
Czech Technical University in Prague
Czech Academy of Sciences
Rice University
Lehigh University
Yale University
University of California at Davis
Shandong University
University of California at Los Angeles
National Cheng Kung University
Chinese Academy of Sciences
University of Science and Technology of China
CAS - Institute of Modern Physics
Lawrence Berkeley National Laboratory
University of California at Berkeley
Eötvös Loránd University
Heidelberg University
Institute for High Energy Physics
Pennsylvania State University
Abilene Christian University
Wayne State University
University of Illinois at Chicago
Southern Connecticut State University
Technische Universität Darmstadt
Valparaiso University
Temple University
Purdue University
Indiana University Bloomington
University of Texas at Austin
Warsaw University of Technology
Goethe University Frankfurt
Argonne National Laboratory
Fudan University
Rutgers - The State University of New Jersey, New Brunswick
Institute of Physics Bhubaneswar
Pusan National University
Institute of Nuclear Physics PAN
Max Planck Institute for Physics (Werner Heisenberg Institute)
Universidade de São Paulo
Michigan State University
United States Naval Academy

Research output: Contribution to journal › Article › peer-review

58 Scopus citations

Abstract

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 (μ2). The data also show that ln(v2/μ2) 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.

Original language	English
Article number	172301
Journal	Physical Review Letters
Volume	122
Issue number	17
DOIs	https://doi.org/10.1103/PhysRevLett.122.172301
State	Published - 30 Apr 2019
Externally published	Yes

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10.1103/PhysRevLett.122.172301

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title = "Azimuthal Harmonics in Small and Large Collision Systems at RHIC Top Energies",

abstract = "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 (μ2). The data also show that ln(v2/μ2) 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.",

author = "J. Adam and L. Adamczyk and Adams, \{J. R.\} and Adkins, \{J. K.\} and S. Kabana and \{STAR Collaboration\}",

note = "Publisher Copyright: {\textcopyright} 2019 American Physical Society.",

year = "2019",

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doi = "10.1103/PhysRevLett.122.172301",

language = "English",

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AU - Adam, J.

AU - Adamczyk, L.

AU - Adams, J. R.

AU - Adkins, J. K.

AU - Kabana, S.

AU - STAR Collaboration

PY - 2019/4/30

Y1 - 2019/4/30

N2 - 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 (μ2). The data also show that ln(v2/μ2) 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.

AB - 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 (μ2). The data also show that ln(v2/μ2) 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.

UR - https://www.scopus.com/pages/publications/85065790259

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DO - 10.1103/PhysRevLett.122.172301

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JO - Physical Review Letters

JF - Physical Review Letters

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ER -

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

Abstract

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