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Measurements of azimuthal anisotropy and charged-particle multiplicity in d + Au collisions at s NN =200, 62.4, 39, and 19.6 GeV

Aidala, C.; Akiba, Y.; Alfred, M.; Aoki, K.; Apadula, N; Ayuso, Carmen; Oskarsson, Anders LU ; Silvermyr, David LU and , (2017) In Physical Review C 96(6).
Abstract
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 flow 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>1.5GeV/c, the data diverges from ampt... (More)
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 flow 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>1.5GeV/c, the data diverges from ampt calculations of v2 relative to the initial geometry, indicating the possible dominance of nongeometry related correlations, referred to as nonflow. We also present measurements of the charged-particle multiplicity (dNch/dη) 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/dη over all η in the PHENIX acceptance. At sNN=62.4, and 39 GeV, v2 scales with dNch/dη at midrapidity and forward rapidity, but falls off at backward rapidity. This departure from the dNch/dη scaling may be a further indication of nonflow effects dominating at backward rapidity. © 2017 American Physical Society. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review C
volume
96
issue
6
publisher
American Physical Society
external identifiers
  • scopus:85040377274
ISSN
2469-9985
DOI
10.1103/PhysRevC.96.064905
language
English
LU publication?
yes
id
dc369155-1822-4f02-960e-b821e192d8b9
date added to LUP
2018-01-22 14:29:39
date last changed
2018-10-21 04:53:37
@article{dc369155-1822-4f02-960e-b821e192d8b9,
  abstract     = {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 flow 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>1.5GeV/c, the data diverges from ampt calculations of v2 relative to the initial geometry, indicating the possible dominance of nongeometry related correlations, referred to as nonflow. We also present measurements of the charged-particle multiplicity (dNch/dη) 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/dη over all η in the PHENIX acceptance. At sNN=62.4, and 39 GeV, v2 scales with dNch/dη at midrapidity and forward rapidity, but falls off at backward rapidity. This departure from the dNch/dη scaling may be a further indication of nonflow effects dominating at backward rapidity. © 2017 American Physical Society.},
  articleno    = {064905},
  author       = {Aidala, C. and Akiba, Y. and Alfred, M. and Aoki, K. and Apadula, N and Ayuso, Carmen and Oskarsson, Anders and Silvermyr, David and , },
  issn         = {2469-9985},
  language     = {eng},
  number       = {6},
  publisher    = {American Physical Society},
  series       = {Physical Review C},
  title        = {Measurements of azimuthal anisotropy and charged-particle multiplicity in d + Au collisions at s NN =200, 62.4, 39, and 19.6 GeV},
  url          = {http://dx.doi.org/10.1103/PhysRevC.96.064905},
  volume       = {96},
  year         = {2017},
}