Neutral pion production with respect to centrality and reaction plane in Au$+$Au collisions at $\sqrt{s_{NN}}$=200 GeV - INSPIRE

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Neutral pion production with respect to centrality and reaction plane in Au $+$ Au collisions at $\sqrt{s_{NN}}$ =200 GeV

PHENIX

Collaboration

•

A. Adare
(
- Colorado U.
)

Aug, 2012

19 pages

Published in:

Phys.Rev.C 87 (2013) 3, 034911

Published: Mar 28, 2013

e-Print:

1208.2254 [nucl-ex]

DOI:

10.1103/PhysRevC.87.034911

Experiments:

BNL-RHIC-PHENIX

View in:

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Abstract: (APS)

The PHENIX experiment has measured the production of π0s in Au+Au collisions at sNN = 200 GeV. The new data offer a fourfold increase in recorded luminosity, providing higher precision and a larger reach in transverse momentum, pT, to 20 GeV/c. The production ratio of η/π0 is 0.46±0.01(stat)±0.05(syst), constant with pT and collision centrality. The observed ratio is consistent with earlier measurements, as well as with the p+p and d+Au values. π0 are suppressed by a factor of 5, as in earlier findings. However, with the improved statistical precision a small but significant rise of the nuclear modification factor RAA vs pT, with a slope of 0.0106±0.00290.0034 (Gev/c)−1, is discernible in central collisions. A phenomenological extraction of the average fractional parton energy loss shows a decrease with increasing pT. To study the path-length dependence of suppression, the π0 yield is measured at different angles with respect to the event plane; a strong azimuthal dependence of the π0 RAA is observed. The data are compared to theoretical models of parton energy loss as a function of the path length L in the medium. Models based on perturbative quantum chromodynamics are insufficient to describe the data, while a hybrid model utilizing pQCD for the hard interactions and anti-de-Sitter space/conformal field theory (AdS/CFT) for the soft interactions is consistent with the data.

Note:

383 authors, 70 institutions, 21 pages, 22 figures, 8 tables. Submitted to Phys. Rev. C. v2 has minor changes in review process. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are (or will be) publicly available at http://www.phenix.bnl.gov/papers.html

25.75.Dw
parton: energy loss
quantum chromodynamics: perturbation theory
path length: dependence
pi0: suppression
PHENIX
AdS/CFT correspondence
transverse momentum: dependence
angular dependence
impact parameter: dependence

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Figures(19)

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PHENIX

Collaboration

•

Mickey Chiu
(
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)

for the collaboration.

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•
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•
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