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Azimuthal anisotropy of neutral pion production in Au+Au collisions at sqrt(s_NN) = 200 GeV: Path-length dependence of jet quenching and the role of initial geometry
Nuclear Experiment · Submitted 18 Jun 2010
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim Calculations which implement a path length dependence steeper than what is implied by current pQCD energy-loss models, show reasonable agreement with the data.
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The abstract, sentence by sentence
We have measured the azimuthal anisotropy of pi0's for 1 < pT < 18 GeV/c for Au+Au collisions at sqrt s_NN = 200 GeV. The observed anisotropy shows a gradual decrease in 3 < pT < 7 - 10 GeV/c, but remains positive beyond 10 GeV/c. The magnitude of this anisotropy is under-predicted, up to at least 10 GeV/c, by current perturbative QCD (pQCD) energy-loss model calculations. An estimate of the increase in anisotropy expected from initial-geometry modification due to gluon saturation effects and initial-geometry fluctuations is insufficient to account for this discrepancy. Calculations which implement a path length dependence steeper than what is implied by current pQCD energy-loss models, show reasonable agreement with the data.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We have measured the azimuthal anisotropy of pi0's for 1 < pT < 18 GeV/c for Au+Au collisions at sqrt s_NN = 200 GeV. | contribution 0.91 | 0.98 | 0.03 | asserted 1.00 |
| s1 | The observed anisotropy shows a gradual decrease in 3 < pT < 7 - 10 GeV/c, but remains positive beyond 10 GeV/c. | result 1.00 | 0.94 | 0.09 | asserted 1.00 |
| s2 | The magnitude of this anisotropy is under-predicted, up to at least 10 GeV/c, by current perturbative QCD (pQCD) energy-loss model calculations. | result 0.84 | 0.30 | 0.14 | asserted 1.00 |
| s3 | An estimate of the increase in anisotropy expected from initial-geometry modification due to gluon saturation effects and initial-geometry fluctuations is insufficient to account for this discrepancy. | result 0.50 | 0.64 | 0.09 | asserted 0.99 |
| s4 | Calculations which implement a path length dependence steeper than what is implied by current pQCD energy-loss models, show reasonable agreement with the data. | interpretation 0.60 | 0.53 | 0.69 | asserted 0.98 |
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The paper
Original abstract
We have measured the azimuthal anisotropy of pi0's for 1 < pT < 18 GeV/c for Au+Au collisions at sqrt s_NN = 200 GeV. The observed anisotropy shows a gradual decrease in 3 < pT < 7 - 10 GeV/c, but remains positive beyond 10 GeV/c. The magnitude of this anisotropy is under-predicted, up to at least 10 GeV/c, by current perturbative QCD (pQCD) energy-loss model calculations. An estimate of the increase in anisotropy expected from initial-geometry modification due to gluon saturation effects and initial-geometry fluctuations is insufficient to account for this discrepancy. Calculations which implement a path length dependence steeper than what is implied by current pQCD energy-loss models, show reasonable agreement with the data.
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References
How the literature uses it
31 arXiv papers cite this in 41 sentences
Papers citing it · 28 sentences without a confident label
Uses its data or values 5 papers
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Fig. [ref] shows the compilation of PHENIX data for $v_2$ of identified hadrons in 20-60% central Au+Au collisions at $√(s_NN)$ = 200 GeV [ref] .
Determination of the Quark Content of Scalar Mesons Using Hydrodynamical Flow in Heavy Ion Collisions · Flow of Scalar Mesons · 1.00
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The data utilized in this study are sourced from the ATLAS [ref] , ALICE [ref] , and PHENIX [ref] collaborations, which encompass \(v_2(p_T, cent)\) and \(v_3(p_T, cent)\) measurements for Pb+Pb collisions at \(√(s_NN) = 2.76\) and 5.02 TeV, Xe+Xe collisions at 5.44 TeV, and Au+Au collisions at 0.2 TeV.
Anisotropy Scaling Functions in Heavy-Ion Collisions: Insights into the `Ultra-Central Flow Puzzle' and Constraints on Transport Coefficients and Nuclear Deformation · Introduction · 1.00
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These include the pion and $ρ$ meson $p_T$ distributions and $v_2(p_T)$ [ref] .
Decipher the $R_{\Psi_{m}}$ correlator in search for the chiral magnetic effect in relativistic heavy ion collisions · ESE study in a toy model · 1.00
Compares with it 1 paper
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The results are shown in Fig. [ref], and corresponding ALICE [ref] , ATLAS [ref] , CMS [ref] , and PHENIX [ref] data are compared.
Azimuthal jet flavor tomography with CUJET2.0 of nuclear collisions at RHIC and LHC · Elliptic flow · 0.94
Cites it as background 6 papers
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In ultrarelativistic heavy-ion collisions at the BNL Relativistic Heavy Ion Collider (RHIC) [ref] and the CERN Large Hadron Collider (LHC) [ref] , strongly-coupled quark-gluon plasmas (sQGP) are created with deconfined color degrees of freedom under extremely hot conditions at sufficiently high beam energies [ref] .
Bridging Soft-Hard Transport Properties of Quark-Gluon Plasmas with CUJET3.0 · Introduction · 0.95
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The hot and dense quark-gluon plasma (QGP) could be produced in high-energy heavy-ion collisions performed at the Relativistic Heavy Ion Collider (RHIC) [ref] and the Large Hadron Collider (LHC) [ref] .
Extracting the jet transport coefficient from hadron suppressions by confronting current NLO parton fragmentation functions · Introduction · 0.98
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Among them, how parton energy loss in QGP depends parametrically on the medium path-length $L$ – addressed in many studies [ref] – is discussed here.
Probing the path-length dependence of parton energy loss via scaling properties in heavy ion collisions · Introduction · 0.95
What it cites · 3 sentences without a confident label
Compares with 1 paper
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To test whether these two ideas could bridge the difference between data and theory, we compare the data with the JR model from [ref] .
Dissecting the role of initial collision geometry for jet quenching observables in relativistic heavy ion collisions · Introduction · 0.81
Cites as background 2 papers
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Prompted by the large amount of experimental data from RHIC, several sophisticated pQCD-based models have been developed in the last decade [ref] .
The theory and phenomenology of perturbative QCD based jet quenching · Introduction · 0.91
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Prompted by the large amount of experimental data from RHIC, several sophisticated pQCD-based models have been developed in the last decade [ref] .
Jet Quenching and Radiative Energy Loss in Dense Nuclear Matter · Introduction · 0.91
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