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Scaling patterns for azimuthal anisotropy in Pb+Pb collisions at Root_s = 2.76 TeV: Further constraints on transport coefficients
Nuclear Experiment · Submitted 16 Mar 2012
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim These results suggest that high-$p_T$ azimuthal anisotropy measurements provide strong constraints for delineating the mechanism(s) for parton energy loss, as well as for reliable extraction of $\hat{q}$.
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The abstract, sentence by sentence
Azimuthal anisotropy measurements for charged hadrons, characterized by the second order Fourier coefficient $v_2$, are used to investigate the path length ($L$) and transverse momentum ($p_T$) dependent jet quenching patterns of the QCD medium produced in Pb+Pb collisions at $\sqrt{s_{NN}}=2.76$\,TeV. $v_2$ shows a linear decrease as $1/\sqrt{p_T}$ and a linear increase with the medium path length difference ($\Delta L$) in- and out of the $\Psi_2$ event plane. These patterns compliment a prior observation of the scaling of jet quenching ($R_{\rm AA}$) measurements. Together, they suggest that radiative parton energy loss is a dominant mechanism for jet suppression, and $v_2$ stems from the difference in the parton propagation length $\Delta L$.An estimate of the transport coefficient $\hat{q}$, gives a value comparable to that obtained in a prior study of the scaling properties of $R_{\rm AA}$. These results suggest that high-$p_T$ azimuthal anisotropy measurements provide strong constraints for delineating the mechanism(s) for parton energy loss, as well as for reliable extraction of $\hat{q}$.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | Azimuthal anisotropy measurements for charged hadrons, characterized by the second order Fourier coefficient $v_2$, are used to investigate the path length ($L$) and transverse momentum ($p_T$) dependent jet quenching patterns of the QCD medium produced in Pb+Pb collisions at $\sqrt{s_{NN}}=2.76$\,TeV. | contribution 0.72 | 0.72 | 0.04 | asserted 0.99 |
| s1 | $v_2$ shows a linear decrease as $1/\sqrt{p_T}$ and a linear increase with the medium path length difference ($\Delta L$) in- and out of the $\Psi_2$ event plane. | result 1.00 | 0.85 | 0.14 | asserted 1.00 |
| s2 | These patterns compliment a prior observation of the scaling of jet quenching ($R_{\rm AA}$) measurements. | result 0.41 | 0.23 | 0.05 | asserted 0.91 |
| s3 | Together, they suggest that radiative parton energy loss is a dominant mechanism for jet suppression, and $v_2$ stems from the difference in the parton propagation length $\Delta L$.An estimate of the transport coefficient $\hat{q}$, gives a value comparable to that obtained in a prior study of the scaling properties of $R_{\rm AA}$. | interpretation 0.99 | 0.79 | 0.50 | hedged possibility 0.95 |
| s4 | These results suggest that high-$p_T$ azimuthal anisotropy measurements provide strong constraints for delineating the mechanism(s) for parton energy loss, as well as for reliable extraction of $\hat{q}$. | interpretation 1.00 | 0.75 | 0.81 | hedged possibility 0.99 |
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The paper
Original abstract
Azimuthal anisotropy measurements for charged hadrons, characterized by the second order Fourier coefficient $v_2$, are used to investigate the path length ($L$) and transverse momentum ($p_T$) dependent jet quenching patterns of the QCD medium produced in Pb+Pb collisions at $\sqrt{s_{NN}}=2.76$\,TeV. $v_2$ shows a linear decrease as $1/\sqrt{p_T}$ and a linear increase with the medium path length difference ($\Delta L$) in- and out of the $\Psi_2$ event plane. These patterns compliment a prior observation of the scaling of jet quenching ($R_{\rm AA}$) measurements. Together, they suggest that radiative parton energy loss is a dominant mechanism for jet suppression, and $v_2$ stems from the difference in the parton propagation length $\Delta L$.An estimate of the transport coefficient $\hat{q}$, gives a value comparable to that obtained in a prior study of the scaling properties of $R_{\rm AA}$. These results suggest that high-$p_T$ azimuthal anisotropy measurements provide strong constraints for delineating the mechanism(s) for parton energy loss, as well as for reliable extraction of $\hat{q}$.
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References
How the literature uses it
2 arXiv papers cite this in 4 sentences
What it cites · 23 sentences without a confident label
Uses the method or tool of 3 papers
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To facilitate comparisons to our earlier scaling analysis of $R_AA$ data, we use the transverse size of the system $R̅$ as an estimate for the path length $L$, as was done in our earlier analyses [ref] .
Scaling patterns of the suppression of $\pi^0$ yields in Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV: links to the transport properties of the QGP · Introduction · 0.84
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To facilitate comparisons to our earlier scaling analysis of $R_AA$ data, we use the transverse size of the system $R̅$ as an estimate for the path length $L$, as was done in our earlier analyses [ref] .
Scaling patterns for the suppression of charged hadron yields in Pb+Pb collisions at Root_s = 2.76 TeV: Constraints on transport coefficients · Introduction · 0.84
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For these calculations, the initial entropy profile in the transverse plane was assumed to be proportional to a linear combination of the number density of participants and binary collisions [ref] .
Is the quark gluon plasma produced in RHIC collisions strongly coupled? · Introduction · 0.92
Uses data or values from 1 paper
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The latter assures that the entropy density weighting used, is constrained by the Pb+Pb hadron multiplicity measurements [ref] .
Dependence on pseudorapidity and centrality of charged hadron production in PbPb collisions at a nucleon-nucleon centre-of-mass energy of 2.76 TeV · Introduction · 0.94
Compares with 2 papers
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A simple estimate of the transport coefficient $q̂$ from the scaled $v_2$ data, gives a value which is similar to the value obtained in a prior study of the scaling properties of $R_AA$ [ref] .
Scaling patterns for the suppression of charged hadron yields in Pb+Pb collisions at Root_s = 2.76 TeV: Constraints on transport coefficients · Introduction · 0.96
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The implied linear increase of $v_2(p_T)$ with $ΔL$ is complimentary to the previously observed $L$ dependence of jet quenching [ref] .
Scaling patterns of the suppression of $\pi^0$ yields in Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV: links to the transport properties of the QGP · Introduction · 0.82
Cites as background 1 paper
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A key ingredient for such a characterization is a full understanding of the mechanism by which hard scattered partons interact and lose energy in the QGP, prior to their fragmentation into topologically aligned high-$p_T$ hadrons or jets [ref] .
Multiple Collisions and Induced Gluon Bremsstrahlung in QCD · Introduction · 0.83
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