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Title: Measurements of azimuthal anisotropy and charged-particle multiplicity in d+Au collisions at √ sNN=200, 62.4, 39, and 19.6 GeV

Abstract

We present measurements of the elliptic flow (v 2) as a function of transverse momentum (p T), pseudorapidity (η), and centrality in d+Au collisions at √ sNN = 200, 62.4, 39, and 19.6 GeV. The beam-energy scan of d+Au collisions provides a testing ground for the onset of ow signatures in small collision systems. We measure a nonzero v 2 signal at all four collision energies, which, at midrapidity and low p T, is consistent with predictions from viscous hydrodynamic models. Comparisons with calculations from parton transport models (based on the ampt Monte Carlo generator) show good agreement with the data at midrapidity to forward (d-going) rapidities and low p T. At backward (Au-going) rapidities and p T > 1:5 GeV/c, the data diverges from ampt calculations of v 2 relative to the initial geometry, indicating the possible dominance of nongeometry related corre- lations, referred to as nonflow. We also present measurements of the charged-particle multiplicity (dN ch/d ) as a function of η in central d+Au collisions at the same energies. We find that in d+Au collisions at √ sNN = 200 GeV the v 2 scales with dN ch/d over all in the PHENIX acceptance. At √ sNNmore » = 62:4, and 39 GeV, v 2 scales with dN ch/d at midrapidity and forward rapidity, but falls o at backward rapidity. Furthermore, this departure from the dN ch/dη scaling may be a further indication of non ow effects dominating at backward rapidity.« less

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); USDOE Office of Science (SC). Nuclear Physics (NP) (SC-26)
Contributing Org.:
PHENIX Collaboration
OSTI Identifier:
1416308
Alternate Identifier(s):
OSTI ID: 1412785; OSTI ID: 1414854
Report Number(s):
BNL-114809-2017-JA; LA-UR-17-27785
Journal ID: ISSN 2469-9985; PRVCAN
Grant/Contract Number:  
SC0012704; AC52-06NA25396
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 96; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Atomic and Nuclear Physics

Citation Formats

Aidala, C., Chiu, M., Akiba, Y., Alfred, M., Aoki, K., Apadula, N., Ayuso, C., and et al. Measurements of azimuthal anisotropy and charged-particle multiplicity in d+Au collisions at √sNN=200, 62.4, 39, and 19.6 GeV. United States: N. p., 2017. Web. doi:10.1103/PhysRevC.96.064905.
Aidala, C., Chiu, M., Akiba, Y., Alfred, M., Aoki, K., Apadula, N., Ayuso, C., & et al. Measurements of azimuthal anisotropy and charged-particle multiplicity in d+Au collisions at √sNN=200, 62.4, 39, and 19.6 GeV. United States. doi:10.1103/PhysRevC.96.064905.
Aidala, C., Chiu, M., Akiba, Y., Alfred, M., Aoki, K., Apadula, N., Ayuso, C., and et al. Tue . "Measurements of azimuthal anisotropy and charged-particle multiplicity in d+Au collisions at √sNN=200, 62.4, 39, and 19.6 GeV". United States. doi:10.1103/PhysRevC.96.064905.
@article{osti_1416308,
title = {Measurements of azimuthal anisotropy and charged-particle multiplicity in d+Au collisions at √sNN=200, 62.4, 39, and 19.6 GeV},
author = {Aidala, C. and Chiu, M. and Akiba, Y. and Alfred, M. and Aoki, K. and Apadula, N. and Ayuso, C. and et al.},
abstractNote = {We present measurements of the elliptic flow (v2) as a function of transverse momentum (pT), pseudorapidity (η), and centrality in d+Au collisions at √sNN = 200, 62.4, 39, and 19.6 GeV. The beam-energy scan of d+Au collisions provides a testing ground for the onset of ow signatures in small collision systems. We measure a nonzero v2 signal at all four collision energies, which, at midrapidity and low pT, is consistent with predictions from viscous hydrodynamic models. Comparisons with calculations from parton transport models (based on the ampt Monte Carlo generator) show good agreement with the data at midrapidity to forward (d-going) rapidities and low pT. At backward (Au-going) rapidities and pT > 1:5 GeV/c, the data diverges from ampt calculations of v2 relative to the initial geometry, indicating the possible dominance of nongeometry related corre- lations, referred to as nonflow. We also present measurements of the charged-particle multiplicity (dNch/d ) as a function of η in central d+Au collisions at the same energies. We find that in d+Au collisions at √sNN = 200 GeV the v2 scales with dNch/d over all in the PHENIX acceptance. At √sNN = 62:4, and 39 GeV, v2 scales with dNch/d at midrapidity and forward rapidity, but falls o at backward rapidity. Furthermore, this departure from the dNch/dη scaling may be a further indication of non ow effects dominating at backward rapidity.},
doi = {10.1103/PhysRevC.96.064905},
journal = {Physical Review C},
number = ,
volume = 96,
place = {United States},
year = {Tue Dec 05 00:00:00 EST 2017},
month = {Tue Dec 05 00:00:00 EST 2017}
}

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This content will become publicly available on December 26, 2018
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