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Evidence from d+Au measurements for final-state suppression of high $p_T$ hadrons in Au+Au collisions at RHIC

Nuclear Experiment · Submitted 17 Jun 2003 · 27 references

Pith's verdict: The d+Au control that made the Au+Au suppression story credible; the data are solid, but the abstract's 'demonstrate' does more work than a d+Au control can carry, and the body knows it.

T0 · AI review

How this review was made: An AI referee (selfhosted/deepseek-v4.1-flash) read the paper on October 29, 2026 and answered a fixed list of questions about it. T0 is the starting level every paper gets. The levels describe how deeply Pith has checked the paper, never the authors.

  1. T0 AI review An AI read the paper and answered a fixed list of questions.
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  3. T2 Compute The paper's code or calculations re-run with the same results.
  4. T3 Formal statement The claims written out in a formal math language a computer can read.
  5. T4 Proof Those claims proved, and the proof checked by computer.

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arXiv IDnucl-ex/0306024 (version 3)
Pith IDFOVC3HQW, Pith's permanent record of this paper and its review
Citationet al. (STAR Collaboration), J. Adams. "Evidence from d+Au measurements for final-state suppression of high $p_T$ hadrons in Au+Au collisions at RHIC." arXiv:nucl-ex/0306024 (2003). https://pith.science/paper/FOVC3HQW
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Referee report
The paper

The paper claims

By colliding deuterons with gold nuclei, the STAR experiment argues that the loss of high-momentum particles in central gold-gold collisions comes from the dense medium produced in the collision, not from the incoming nuclei.

The reading

The paper asks whether the large loss of high-transverse-momentum hadrons and back-to-back jet pairs seen in central gold-gold collisions at RHIC is caused before the collision, by the structure of the incoming nuclei, or after it, by the dense matter the collision produces. The test is deuteron-gold: if an initial-state effect such as shadowing, multiple scattering, or gluon saturation were responsible, the same loss should appear when a deuteron hits a gold nucleus. STAR measures charged hadrons at 200 GeV and finds the opposite pattern: the inclusive yield is enhanced relative to a binary-scaled proton-proton reference, and the away-side correlation peak remains close to its proton-proton shape. The authors read this as a control that removes the initial-state explanation and leaves final-state energy loss of partons in the gold-gold medium as the cause.

What carries the argument

The argument rests on two measured quantities and one control. The first is the nuclear modification ratio $$R_{AB}(p_T) = rac{$d^{2}$N/dp_T d extbackslash eta}{T_{AB} $d^{2}$ extbackslash sigma_{pp}/dp_T d extbackslash eta},$$ where $T_{AB} = extbackslash langle N_{ extbackslash rm bin} extbackslash rangle / extbackslash sigma_{pp}^{ extbackslash rm inel}$ converts the p+p cross section into a binary-collision-scaled expectation; $R_{AB}=1$ means hard processes scale with the number of nucleon-nucleon collisions, $R_{AB}>1$ is enhancement, and $R_{AB}<1$ is suppression. The second is the two-particle azimuthal distribution $D( extbackslash Delta extbackslash phi)$, the per-trigger yield of associated particles relative to a high-$p_T$ trigger, fitted as a near-side Gaussian, a back-to-back Gaussian at $ extbackslash Delta extbackslash phi = extbackslash pi$, and a constant pedestal. The control is d+Au, where initial-state nuclear effects can act but a large Au+Au-like medium is not expected; the Glauber calculation supplies $ extbackslash langle N_{ extbackslash rm bin} extbackslash rangle = 15.0 extbackslash pm 1.1$ for the 20% highest-multiplicity d+Au events and sets the baseline.

Extended reading notes

Core claim

In minimum-bias and the 20% most central d+Au collisions, the nuclear modification ratio $R_{AB}(p_T)$ exceeds 1 for $2 < p_T < 7$ GeV/$c$, with a peak in the range $2.5 < p_T < 4$ GeV/$c$, while the two-particle azimuthal distribution keeps both a near-side jet peak and a back-to-back peak. The back-to-back peak broadens only slightly and is not strongly suppressed; the main change from p+p is a growing constant pedestal. The authors argue that this is the signature of initial-state multiple scattering, the Cronin effect, together with shadowing, not of the strong suppression seen in central Au+Au. Because the initial-state control does not show the suppression, they conclude that the Au+Au loss of inclusive yield and away-side pairs is due to final-state interactions with the dense medium generated in those collisions.

Load-bearing premise

The load-bearing premise is that d+Au is an adequate control for initial-state effects in Au+Au: any shadowing, multiple scattering, or saturation mechanism capable of producing the Au+Au suppression would also show up, at the measured centralities, as suppression in d+Au.

Editorial extensions

If this is right

  • Initial-state gluon saturation alone cannot be the explanation for the central Au+Au high-$p_T$ suppression; any successful model must include final-state parton energy loss in the produced medium.
  • The d+Au data establish a Cronin-type enhancement of charged hadrons in the $2$-$7$ GeV/$c$ range at RHIC, which constrains nuclear shadowing and multiple-scattering models of the gold nucleus.
  • Away-side jet correlations survive in d+Au with only modest broadening, so the strong away-side loss is specific to the larger Au+Au system rather than to nuclear collisions in general.
  • The centrality dependence in d+Au separates initial-state enhancement from final-state suppression: more central d+Au events show a larger yield enhancement but no corresponding disappearance of back-to-back pairs.
  • The same deuteron-gold control strategy can be used at other collision energies and with other projectiles to test whether high-$p_T$ suppression tracks the size of the produced medium.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • A sharper test than d+Au versus Au+Au is a system scan at matched $ extbackslash langle N_{ extbackslash rm bin} extbackslash rangle$ or matched path length: if the suppression tracks produced energy density rather than the number of binary collisions, the final-state interpretation gains a quantitative handle.
  • The pedestal grows with centrality but not in proportion to $ extbackslash langle N_{ extbackslash rm bin} extbackslash rangle$; that nonlinearity may encode trigger bias or correlated soft-particle production and could be checked by varying the trigger $p_T$ threshold.
  • The height and position of the Cronin peak in d+Au could be used to extract an effective transport coefficient only if the same energy-loss calculation reproduces both the d+Au enhancement and the Au+Au suppression; a joint fit would be a useful next step.
  • If the medium is short-lived in d+Au, one would expect no away-side suppression but perhaps a small broadening; measuring the broadening versus system size would test whether the away-side loss turns on gradually or abruptly.
Original abstract

We report measurements of single-particle inclusive spectra and two-particle azimuthal distributions of charged hadrons at high transverse momentum (high $p_T$) in minimum bias and central d+Au collisions at $\sqrt{s_{NN}}$=200 GeV. The inclusive yield is enhanced in d+Au collisions relative to binary-scaled p+p collisions, while the two-particle azimuthal distributions are very similar to those observed in p+p collisions. These results demonstrate that the strong suppression of the inclusive yield and back-to-back correlations at high $p_T$ previously observed in central Au+Au collisions are due to final-state interactions with the dense medium generated in such collisions.

The compiled record

The paper's own sentences, arranged, kept beside the review and separate from it. Each label is drawn from a closed vocabulary; the number beside it is the probability the classifier gave that label. Numbers in the tables are the authors', checked by code. No sentence in this record was written by a model.

Compiled by classifier-1.13.0 via TypeSafe API, question bank abstract-p1-20260923, 2026-09-23: 1 request, 3,107 input tokens.

What the abstract itself states, as probabilities: claims first 0.03 · states limitation 0.07 · human participants 0.02 · controlled comparison 0.93 · randomized assignment 0.02 · states quantitative result 0.18 · compares with prior results 0.97 · mentions code or data availability 0.02.

The abstract, sentence by sentence

arXiv listing abstract v3. Results and the main claim are underlined; .

We report measurements of single-particle inclusive spectra and two-particle azimuthal distributions of charged hadrons at high transverse momentum (high $p_T$) in minimum bias and central d+Au collisions at $\sqrt{s_{NN}}$=200 GeV. The inclusive yield is enhanced in d+Au collisions relative to binary-scaled p+p collisions, while the two-particle azimuthal distributions are very similar to those observed in p+p collisions. These results demonstrate that the strong suppression of the inclusive yield and back-to-back correlations at high $p_T$ previously observed in central Au+Au collisions are due to final-state interactions with the dense medium generated in such collisions.

background contribution method result interpretation main claim

What the classifier reports for each sentence. The number is the probability it gave the label.
#sentencerolethe authors' own workstates the main conclusionstrength
s0 We report measurements of single-particle inclusive spectra and two-particle azimuthal distributions of charged hadrons at high transverse momentum (high $p_T$) in minimum bias and central d+Au collisions at $\sqrt{s_{NN}}$=200 GeV. contribution 0.97 0.97 0.02 asserted 0.99
s1 The inclusive yield is enhanced in d+Au collisions relative to binary-scaled p+p collisions, while the two-particle azimuthal distributions are very similar to those observed in p+p collisions. result 1.00 0.93 0.08 asserted 1.00
s2 These results demonstrate that the strong suppression of the inclusive yield and back-to-back correlations at high $p_T$ previously observed in central Au+Au collisions are due to final-state interactions with the dense medium generated in such collisions. interpretation 1.00 0.55 0.96 asserted 1.00

What kind of paper the classifier reports this is: empirical study 1.00 · evidence from observation or experiment 1.00.

What was examined, and what was not

sources read
  • arXiv listing abstract v3
not examined
  • full text
  • figures and tables
  • references and citing sentences
  • relations to other papers
levels run
  • P abstract
not run
  • S sections
  • T body sentences
  • C citations
  • R cross-paper relations

Every quoted sentence on this record is the authors'. Every label is from Pith's closed vocabulary, with the probability shown beside it. Every number in the measurements table is the authors', checked by code. Record as JSON

Figures
Figure 1. FIG. 1: Uncorrected charged particle multiplicity distrib
Figure 2. shows the invariant inclusive pT distribution of (h+ + h−)/2 within |η|<0.5 for minimum bias and cen￾tral d+Au collisions, together with that for p+p collisions from [5]. The error bars are the quadrature sum of sta￾tistical errors and point-to-point systematic uncertain￾ties. The normalization uncertainty for d+Au collisions is 10%. Nuclear effects on hadron production in d+Au and Au+Au collisions are measured through comparison to the p+p spectrum using the ratio RAB(pT ) = d 2N/dpT dη TAB d 2σ pp/dpT dη , (1) where d 2N/dpT dη is the differential yield per event in the nuclear…
Figure 4. FIG. 4: (a) Efficiency corrected two-particle azimuthal dis

Showing 3 of the paper's 4 figures. See all figures in the PDF ↗ Figures reproduced from arXiv:nucl-ex/0306024 by the authors.

References
How the literature uses it

76 arXiv papers cite this in 92 sentences

Each citing sentence is taken from the citing paper's LaTeX source and typed by Pith's classifier. A label appears at probability 0.8 or more (0.95 for support), a contest at 0.7 or more; the quoted words are the citing authors'. How each label was checked · JSON

Papers whose main result relates to this one's

Found among the papers closest to this one by title and main claim. Pith's classifier compared each pair's main results and a second model family confirmed the relation; checked against two further families, shown conflicts agreed 118 times in 120 and shown same results 218 times in 239. The quoted sentence is the other paper's main claim.

States the same result 3 papers

Papers citing it · 71 sentences without a confident label

Uses its method or tool 2 papers
Uses its data or values 1 paper
Compares with it 1 paper
Cites it as background 16 papers

Discussion

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