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arxiv: 2604.13935 · v1 · submitted 2026-04-15 · ⚛️ nucl-ex · hep-ex

Recognition: unknown

Measurement of jet quenching in O+O collisions at sqrt{s_NN}=200 GeV by the STAR experiment at RHIC

STAR Collaboration
Authors on Pith no claims yet

Pith reviewed 2026-05-10 11:49 UTC · model grok-4.3

classification ⚛️ nucl-ex hep-ex
keywords jet quenchingO+O collisionsSTAR experimentRHICquark-gluon plasmasmall collision systemsheavy-ion collisionsparticle correlations
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The pith

Jet quenching appears in oxygen-oxygen collisions through suppressed recoil yields at RHIC.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The STAR experiment measures correlations between high-momentum trigger hadrons and recoiling hadrons or jets in oxygen-oxygen collisions at 200 GeV per nucleon pair. When events are divided by activity level, the normalized yields of associated particles drop by about 20 percent in the high-activity sample compared with the low-activity sample. This drop matches a 0.70 GeV/c downward shift in the transverse momentum of large-radius jets, showing that the trigger particles lose energy while traversing the collision zone. A sympathetic reader cares because the result indicates that a dense medium capable of quenching jets can form even in these small systems. The measurements therefore test whether the conditions for quark-gluon plasma production require large nuclei or can arise in lighter collisions as well.

Core claim

In event-activity selected O+O collisions at sqrt(s_NN)=200 GeV, yields of associated charged hadrons and charged-particle jets recoiling from high-p_T triggers are suppressed by approximately 20 percent in high-activity relative to low-activity collisions, an absence of suppression being excluded at high significance; the suppression corresponds to a p_T shift of 0.70 plus or minus 0.15 (stat.) plus or minus 0.10 (syst.) GeV/c for R=0.5 jets and is interpreted as the redistribution of jet energy due to final-state interactions.

What carries the argument

Event-activity classified two-particle and jet-hadron correlations that compare normalized recoil yields between high- and low-activity classes to isolate final-state medium effects.

If this is right

  • The energy removed from high-p_T jets is redistributed to lower-momentum particles through interactions in the collision medium.
  • A quark-gluon plasma dense enough to quench jets can form in small O+O systems.
  • The strength of the observed suppression provides a quantitative measure of medium-induced energy loss at this collision energy.
  • The same correlation technique can be applied to other light-ion systems to map how quenching depends on system size.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • If initial-state effects dominated, the suppression would not appear selectively in the high-activity class after normalization; the data therefore favor final-state medium interactions.
  • The result encourages measurements of angular distributions or identified-particle yields around the same triggers to reveal the detailed pattern of energy redistribution.
  • Higher-statistics data sets in the same or similar light-ion collisions could test whether the p_T shift scales with estimated path length through the medium.

Load-bearing premise

The selection of high event activity primarily captures collisions with a denser final-state medium rather than differences in initial nuclear structure or biases in trigger identification.

What would settle it

A model calculation that reproduces the measured 20 percent suppression and 0.70 GeV/c p_T shift using only initial-state nuclear modifications and no final-state medium would falsify the jet-quenching interpretation.

Figures

Figures reproduced from arXiv: 2604.13935 by STAR Collaboration.

Figure 1
Figure 1. Figure 1: FIG. 1. Self–normalized distributions of the raw number of [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2. Top: raw di–hadron correlations as a function [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: , upper left panel, shows values of di–hadron ICP for near–side and recoil associated charged hadrons, in three high–EA intervals. The near–side ICP is consis￾tent with unity, indicating that the jets generating trig￾ger particles experience negligible energy loss [52]. In contrast, the recoil yield is suppressed, i.e. ICP < 1. For the 0-10% EA interval, ICP = 0.836 ± 0.021 (stat.) ± 0.032 (syst.). The EA … view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4. Ratios of self-normalized nMIP [PITH_FULL_IMAGE:figures/full_fig_p008_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: FIG. 5. Recoil jet spectra as a function of [PITH_FULL_IMAGE:figures/full_fig_p009_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: FIG. 6. Recoil jet [PITH_FULL_IMAGE:figures/full_fig_p010_6.png] view at source ↗
read the original abstract

The STAR experiment at the Relativistic Heavy Ion Collider presents measurements of correlations between charged hadron triggers of high transverse momenta ($7 < p_{\rm T} < 30$ GeV/$c$) with recoiling charged hadrons ($3 < p_{\rm T} < 7$ GeV/$c$) or charged--particle jets ($p_{\rm T, jet} > 8$ GeV/$c$) in event--activity selected O+O collisions at $\sqrt{s_{\mathrm {NN}}}=200$ GeV. Yields of associated hadrons and jets, normalized by the number of trigger hadrons, are suppressed by approximately 20\% in high event activity relative to low event activity collisions, with an absence of suppression excluded with high significance. This suppression corresponds to a shift in p_{\rm T} of $0.70\pm0.15~(\rm stat.)~\pm0.10~(\rm syst.)$ GeV/$c$ for large--radius charged--particle jets ($R=0.5$), quantifying their energy redistribution due to final--state interactions. These measurements provide strong evidence for jet quenching in O+O collisions at $\sqrt{s_\mathrm{NN}}=200$ GeV, offering new insight into quark--gluon plasma formation in small collision systems.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 1 minor

Summary. The paper reports STAR measurements of correlations between high-pT charged hadron triggers (7 < pT < 30 GeV/c) and associated charged hadrons (3 < pT < 7 GeV/c) or charged-particle jets (pT,jet > 8 GeV/c) in event-activity selected O+O collisions at √s_NN=200 GeV. It finds ~20% suppression of per-trigger yields in high- vs. low-event-activity collisions, corresponding to a pT shift of 0.70±0.15(stat.)±0.10(syst.) GeV/c for R=0.5 jets, and claims this as strong evidence for jet quenching and QGP formation in small systems.

Significance. If the final-state interpretation holds after addressing initial-state alternatives, the result would be significant for establishing the onset of jet quenching in the smallest systems at RHIC, extending knowledge of medium effects beyond larger A+A collisions.

major comments (2)
  1. [Abstract] Abstract: The central claim of 'strong evidence' for jet quenching interprets the ~20% suppression and 0.70 GeV/c pT shift as final-state energy loss. However, no quantitative comparison to initial-state-only models (e.g., HIJING or EPOS without quenching) using the same trigger and event-activity selections is presented, so nuclear shadowing, Cronin broadening, or impact-parameter-dependent initial parton distributions cannot be excluded as alternative explanations for the observed difference.
  2. [Results and methods] Results and methods sections: The statistical significance and systematic uncertainties on the suppression and pT shift depend on background subtraction for the correlations and the specific jet reconstruction algorithm. The manuscript provides insufficient detail on these procedures and the full breakdown of systematic studies to support the quantified energy redistribution claim.
minor comments (1)
  1. [Abstract] Abstract: The definition of 'event activity' (e.g., via mid-rapidity multiplicity or forward energy) is used for selection but not explicitly defined in the summary, which would aid reader clarity.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the careful and constructive review of our manuscript. The comments raise important points about the strength of the final-state interpretation and the level of detail in the methods. We address each major comment below and will revise the manuscript to incorporate additional material where appropriate.

read point-by-point responses

  1. Referee: [Abstract] Abstract: The central claim of 'strong evidence' for jet quenching interprets the ~20% suppression and 0.70 GeV/c pT shift as final-state energy loss. However, no quantitative comparison to initial-state-only models (e.g., HIJING or EPOS without quenching) using the same trigger and event-activity selections is presented, so nuclear shadowing, Cronin broadening, or impact-parameter-dependent initial parton distributions cannot be excluded as alternative explanations for the observed difference.

    Authors: We agree that explicit comparisons to initial-state models would strengthen the interpretation. The observed suppression and pT shift are presented as evidence for final-state effects because the event-activity selection isolates differences at fixed trigger pT, and the magnitude of the shift is larger than typical initial-state modifications in small systems. Nevertheless, to directly address the referee's concern, we will add quantitative comparisons to HIJING and EPOS (without quenching) using identical trigger and event-activity selections in the revised manuscript. These will show that such models do not reproduce the measured suppression, thereby supporting the final-state interpretation. revision: yes

  2. Referee: [Results and methods] Results and methods sections: The statistical significance and systematic uncertainties on the suppression and pT shift depend on background subtraction for the correlations and the specific jet reconstruction algorithm. The manuscript provides insufficient detail on these procedures and the full breakdown of systematic studies to support the quantified energy redistribution claim.

    Authors: We acknowledge that additional methodological detail is warranted. In the revised manuscript we will expand the description of the background subtraction procedure for both the hadron-hadron and hadron-jet correlations, including the specific techniques, acceptance corrections, and any assumptions. We will also include a complete breakdown of systematic uncertainties, covering contributions from the jet reconstruction algorithm (R parameter, pT thresholds, and underlying-event subtraction), to better substantiate the reported suppression and pT shift values. revision: yes

Circularity Check

0 steps flagged

Direct experimental measurement; no derivation reduces to inputs by construction

full rationale

This is a pure experimental report of measured yields and suppressions in high- versus low-event-activity O+O collisions. The ~20% suppression and 0.70 GeV/c pT shift are extracted directly from data (trigger-normalized associated hadron/jet yields) without any fitted parameter, ansatz, or self-cited uniqueness theorem that forces the final-state interpretation. No equation or step equates the reported result to its own selection or normalization by construction; the central claim remains an empirical observation whose interpretation as quenching is independent of the measurement itself.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The claim rests on standard assumptions in heavy-ion analysis such as accurate trigger particle identification and background estimation; no new free parameters, axioms beyond domain standards, or invented entities are introduced.

axioms (1)
  • domain assumption Standard assumptions regarding trigger hadron selection, background subtraction, and event activity classification in heavy-ion collisions.
    Invoked implicitly in the normalization of yields and comparison between high and low activity classes.

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Forward citations

Cited by 1 Pith paper

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