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arxiv: 2606.00973 · v2 · pith:C6BUDUBPnew · submitted 2026-05-31 · ⚛️ nucl-ex · hep-ex

Measurements of jet quenching with semi-inclusive hadron-jet correlations in Ru+Ru and Zr+Zr collisions at sqrt{s_NN}=200 GeV

The STAR Collaboration This is my paper

Pith reviewed 2026-06-28 16:22 UTC · model grok-4.3

classification ⚛️ nucl-ex hep-ex
keywords jet quenchingsemi-inclusive hadron-jet correlationsRu+Ru collisionsZr+Zr collisionsquark-gluon plasmapartonic energy lossintra-jet broadeningSTAR experiment
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The pith

Suppression of the recoil jet yield is observed in central Ru+Ru and Zr+Zr collisions at 200 GeV, indicating medium-induced partonic energy loss.

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

The STAR experiment measures the semi-inclusive yield of charged-particle jets recoiling from high transverse momentum charged-hadron triggers in centrality-selected Ru+Ru and Zr+Zr collisions at 200 GeV. By comparing trigger-normalized recoil yields in central versus peripheral collisions, the analysis quantifies the effects of jet quenching from the quark-gluon plasma. Suppression of the recoil yield appears in central events, consistent with partonic energy loss. The ratio of recoil jet yields for small versus large resolution parameters is also suppressed in central collisions, indicating medium-induced intra-jet broadening. These intermediate-mass systems provide insight into the spatial and temporal aspects of quenching when compared with smaller and larger collision systems.

Core claim

Measurements show suppression of the trigger-normalized recoil jet yield in central relative to peripheral Ru+Ru and Zr+Zr collisions, indicating medium-induced partonic energy loss due to quenching. The ratio of recoil jet yields for small and large resolution parameters is suppressed in central relative to peripheral collisions, characteristic of medium-induced intra-jet broadening.

What carries the argument

Semi-inclusive hadron-jet correlations, with recoil jet yields normalized to the number of high-pT hadron triggers and compared across centrality classes at different resolution parameters.

Load-bearing premise

Observed differences between central and peripheral collisions arise primarily from medium-induced jet quenching rather than from initial-state nuclear effects, trigger biases, or choices in centrality selection and background subtraction.

What would settle it

No suppression of the normalized recoil jet yield in central collisions relative to peripheral ones, after background subtraction, would falsify the claim of medium-induced energy loss.

Figures

Figures reproduced from arXiv: 2606.00973 by The STAR Collaboration.

Figure 1
Figure 1. Figure 1: Distributions of Y h+jet(p reco,ch T,jet ) in central (upper panels) and peripheral (lower panels) Zr+Zr collisions for R = 0.2 (left panels) and R = 0.5 (right panels). Upper sub-panels: SE (red points) and ME (shaded histogram) distributions; ME normalization region (blue histogram); and difference distribution (black crosses). Error bars are statistical only. Lower sub-panels: ratio of Y h+jet(p reco,ch… view at source ↗
Figure 2
Figure 2. Figure 2: Distributions of Y˜ h+jet(p ch T,jet) for Ru+Ru and Zr+Zr collisions at √ sNN = 200 GeV, for R = 0.2 (left) and 0.5 (right). Upper panels: central collisions; lower panels: peripheral collisions. Statistical errors and systematic uncertainties are indicated by error bars and shaded boxes, respectively. for central relative to peripheral collisions provides direct evi￾dence of partonic energy loss due to je… view at source ↗
Figure 4
Figure 4. Figure 4: Distributions of ICP for combined Ru+Ru and Zr+Zr data at √ sNN = 200 GeV from [PITH_FULL_IMAGE:figures/full_fig_p007_4.png] view at source ↗
Figure 7
Figure 7. Figure 7: Distributions of Y˜ h+jet(p ch T,jet) for the combined Ru+Ru and Zr+Zr data, for central and peripheral collisions and R = 0.2, 0.3, 0.4, and 0.5. Statis￾tical errors and systematic uncertainties are indicated by error bars and shaded boxes, respectively. R = 0.3 and 0.4 [PITH_FULL_IMAGE:figures/full_fig_p008_7.png] view at source ↗
Figure 6
Figure 6. Figure 6: Distributions of Y˜ h+jet(p ch T,jet) for Zr+Zr and Ru+Ru collisions at √ sNN = 200 GeV, for R = 0.3 (left) and 0.4 (right). Upper panels: central collisions; lower panels: peripheral collisions. Statistical errors and systematic uncertainties are indicated by error bars and shaded boxes, respectively [PITH_FULL_IMAGE:figures/full_fig_p008_6.png] view at source ↗
Figure 8
Figure 8. Figure 8: Distributions of recoil jet yield ratios between small [PITH_FULL_IMAGE:figures/full_fig_p009_8.png] view at source ↗
read the original abstract

The STAR experiment at RHIC reports measurements of the semi-inclusive yield of charged-particle jets recoiling from high transverse momentum charged-hadron triggers in centrality-selected Ru+Ru and Zr+Zr collisions at the nucleon-nucleon center-of-mass energy of 200 GeV. The effects of jet quenching, arising from the interaction of jets with the quark-gluon plasma, are quantified by comparing trigger-normalized recoil yields in central and peripheral collisions. Such measurements with intermediate-mass beams provide unique insight into spatial and temporal aspects of jet quenching. Suppression of the recoil yield in central collisions is observed, indicating medium-induced partonic energy loss due to quenching. The ratio of recoil jet yields for small and large resolution parameter is found to be suppressed in central relative to peripheral collisions, characteristic of medium-induced intra-jet broadening. The results are compared to similar measurements in smaller and larger 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 / 2 minor

Summary. The STAR experiment reports measurements of semi-inclusive charged-particle jet yields recoiling from high-pT hadron triggers in centrality-selected Ru+Ru and Zr+Zr collisions at √s_NN=200 GeV. Jet quenching is quantified via trigger-normalized recoil yields, with suppression observed in central relative to peripheral collisions interpreted as medium-induced partonic energy loss; the ratio of yields for small versus large resolution parameter is also suppressed in central collisions, taken as evidence for medium-induced intra-jet broadening. Results are compared to measurements in smaller and larger systems.

Significance. If the central-peripheral contrast is shown to arise from medium effects rather than initial-state or analysis artifacts, the work supplies new data on jet quenching in intermediate-mass isobar systems, offering constraints on the path-length and time dependence of energy loss and broadening in the QGP at RHIC energies.

major comments (2)
  1. [§IV (Results)] §IV (Results): the attribution of recoil-yield suppression to medium-induced quenching is load-bearing for the central claim, yet the manuscript provides no quantitative estimate or dedicated comparison demonstrating that initial-state nuclear modifications (e.g., nPDF differences between Ru and Zr) are subdominant to the observed central-peripheral difference.
  2. [§III (Analysis)] §III (Analysis): the background-subtraction and underlying-event correction procedures for the semi-inclusive correlations are not shown to be free of centrality-dependent biases; without explicit tests (e.g., variation of subtraction parameters or comparison to peripheral baselines), the quenching interpretation cannot be isolated from possible analysis artifacts.
minor comments (2)
  1. Figure captions should explicitly state the pT ranges of the trigger hadrons and the resolution parameters R used for the jet reconstruction.
  2. The abstract could note the integrated luminosity or number of events analyzed to allow readers to gauge statistical precision.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the careful review and constructive comments. We respond to each major comment below.

read point-by-point responses

  1. Referee: [§IV (Results)] §IV (Results): the attribution of recoil-yield suppression to medium-induced quenching is load-bearing for the central claim, yet the manuscript provides no quantitative estimate or dedicated comparison demonstrating that initial-state nuclear modifications (e.g., nPDF differences between Ru and Zr) are subdominant to the observed central-peripheral difference.

    Authors: The central-peripheral comparison is performed separately within each isobar system (Ru+Ru and Zr+Zr). Nuclear PDFs are properties of the colliding nuclei and are therefore identical for central and peripheral collisions in a given system; any nPDF modifications cancel in the central-to-peripheral ratio. Differences between the Ru and Zr nPDFs are consequently irrelevant to the observed suppression. We will add an explicit clarifying statement in the revised Section IV. revision: yes

  2. Referee: [§III (Analysis)] §III (Analysis): the background-subtraction and underlying-event correction procedures for the semi-inclusive correlations are not shown to be free of centrality-dependent biases; without explicit tests (e.g., variation of subtraction parameters or comparison to peripheral baselines), the quenching interpretation cannot be isolated from possible analysis artifacts.

    Authors: We agree that explicit tests are needed to demonstrate robustness. In the revised manuscript we will add dedicated validation studies, including variation of the subtraction parameters and comparison of the corrected peripheral yields against expectations from smaller collision systems, to confirm the absence of significant centrality-dependent biases. revision: yes

Circularity Check

0 steps flagged

Direct experimental measurement report with no circular derivations

full rationale

This is an experimental paper reporting measured semi-inclusive hadron-jet yields and their central-peripheral ratios in Ru+Ru/Zr+Zr collisions. No derivations, model equations, fitted parameters renamed as predictions, or self-citation chains are present in the abstract or described analysis. The claims rest on direct data comparisons, with external benchmarks (other collision systems) providing independent context. No load-bearing steps reduce to inputs by construction.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

This is an experimental measurement paper. No free parameters, axioms, or invented entities are introduced in the theoretical sense; the work relies on standard detector techniques and analysis methods in heavy-ion physics.

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