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arxiv: 2606.20463 · v1 · pith:NXQPWCKWnew · submitted 2026-06-18 · ⚛️ nucl-ex · hep-ex

Observation of centrality-dependent dijet transverse momentum imbalance in O+O and Ne+Ne collisions at sqrt{s_(NN)} = 5.36 TeV with the ATLAS detector

ATLAS Collaboration This is my paper

Pith reviewed 2026-06-26 14:34 UTC · model grok-4.3

classification ⚛️ nucl-ex hep-ex
keywords dijet imbalancejet quenchingO+O collisionsNe+Ne collisionscentrality dependencepartonic energy lossquark-gluon plasma
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The pith

Dijet imbalance grows with centrality in O+O and Ne+Ne collisions, indicating partonic energy loss in small systems.

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

The ATLAS experiment measures dijet momentum balance via the x_J ratio of sub-leading to leading jet transverse momenta in oxygen-oxygen and neon-neon collisions at 5.36 TeV. Self-normalized x_J distributions deviate more from the proton-proton reference as collisions grow more central and nuclear overlap increases. This centrality trend matches the pattern expected from medium-induced energy loss of partons. The effect appears even though these systems are much smaller than the lead-lead and xenon-xenon collisions studied before. The measurements open a window on how jet quenching scales with the size of the nuclear medium.

Core claim

In O+O and Ne+Ne collisions at 5.36 TeV, the self-normalized x_J distributions for azimuthally back-to-back dijets show increasingly large deviations from the pp reference as collisions become more central, consistent with medium-induced partonic energy loss that persists in collision systems considerably smaller than Pb+Pb and Xe+Xe.

What carries the argument

The x_J ratio of sub-leading jet p_T to leading jet p_T, examined in self-normalized distributions binned by collision centrality and compared against the pp reference.

If this is right

  • Jet quenching is shown to persist in systems smaller than Pb+Pb and Xe+Xe.
  • A new regime is established for studying the path-length dependence of jet quenching.
  • The onset of quark-gluon plasma effects is constrained in small nuclear collision systems.

Where Pith is reading between the lines

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

  • Higher-statistics runs in still lighter systems could map the minimal volume needed for detectable quenching.
  • Pairing the x_J observable with photon-jet or heavy-flavor channels would help separate medium effects from initial-state contributions.

Load-bearing premise

The observed deviations in x_J arise from medium-induced partonic energy loss rather than initial-state nuclear effects or detector response differences.

What would settle it

No centrality dependence remaining in x_J after full detector corrections or in a control sample without expected medium would contradict the medium-loss interpretation.

read the original abstract

The ATLAS experiment presents an observation of a centrality-dependent dijet transverse momentum imbalance in O+O and Ne+Ne collisions at a nucleon-nucleon center-of-mass energy of 5.36 TeV at the Large Hadron Collider. The measurement uses 8.0 nb$^{-1}$ of O+O and 1.0 nb$^{-1}$ of Ne+Ne data collected in 2025, together with 386 pb$^{-1}$ of \textit{pp} data at the same energy used as a reference. The dijet momentum balance is quantified using the ratio of the sub-leading jet transverse momentum to that of the leading jet, $x_J$. For dijets produced azimuthally back-to-back, the self-normalized $x_J$ distributions exhibit increasingly large deviations from the \textit{pp} reference as collisions become more central, corresponding to an increasing overlap of the colliding nuclei. The observed centrality dependence is consistent with medium-induced partonic energy loss in O+O and Ne+Ne collisions, demonstrating that such effects persist in collision systems considerably smaller than Pb+Pb and Xe+Xe. These results establish a new regime for investigating the path-length dependence of jet quenching and constrain the onset of quark-gluon plasma effects in small nuclear 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 ATLAS experiment reports an observation of centrality-dependent dijet transverse momentum imbalance in O+O and Ne+Ne collisions at √s_NN = 5.36 TeV. The dijet balance is quantified via the ratio x_J of sub-leading to leading jet p_T. Self-normalized x_J distributions in these systems show increasing deviations from a same-energy pp reference as collisions become more central (increasing nuclear overlap), and this trend is interpreted as consistent with medium-induced partonic energy loss, extending jet-quenching studies to systems smaller than Pb+Pb and Xe+Xe.

Significance. If the central interpretation holds after addressing initial-state contributions, the result would be significant: it would demonstrate that jet-quenching signatures persist in modest nuclear-overlap systems, thereby constraining the path-length dependence of energy loss and the minimal conditions for QGP formation. The same-energy pp reference is a strength for direct comparison.

major comments (2)
  1. [Abstract / interpretation] Abstract and interpretation section: the claim that observed x_J centrality dependence arises from medium-induced energy loss (rather than initial-state nuclear effects such as nuclear PDFs, Cronin broadening, or isospin differences) is load-bearing for the central conclusion. The pp reference at the same energy does not by itself isolate final-state effects; explicit modeling or data-driven bounds on initial-state contributions are required to support the interpretation.
  2. [Results] Results section: the abstract states deviations increase with centrality, but without reported details on jet reconstruction algorithms, background subtraction, or the size of systematic uncertainties on x_J (as flagged in the review), it is not possible to verify that the observed trends exceed experimental artifacts or detector-response differences between systems.
minor comments (2)
  1. [Analysis] Clarify the exact centrality binning and how self-normalization of x_J is performed to allow direct comparison across systems.
  2. [Introduction] Add a reference to prior small-system jet measurements (e.g., in p+Pb) for context on the onset of quenching.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the detailed review and constructive comments on our manuscript. We address each major comment below. Where the comments identify gaps in supporting the central interpretation or in experimental documentation, we have revised the manuscript accordingly.

read point-by-point responses

  1. Referee: [Abstract / interpretation] Abstract and interpretation section: the claim that observed x_J centrality dependence arises from medium-induced energy loss (rather than initial-state nuclear effects such as nuclear PDFs, Cronin broadening, or isospin differences) is load-bearing for the central conclusion. The pp reference at the same energy does not by itself isolate final-state effects; explicit modeling or data-driven bounds on initial-state contributions are required to support the interpretation.

    Authors: We agree that the same-energy pp reference alone does not fully isolate final-state effects and that explicit discussion of initial-state contributions is required to support the medium-induced energy loss interpretation. In the revised manuscript we have added a dedicated subsection in the interpretation section that quantifies the expected size of nuclear-PDF modifications, Cronin broadening, and isospin effects using the nPDF sets of EPPS21 and nCTEQ15 together with a simple k_T-broadening model. These calculations show that the predicted initial-state modifications to x_J are at most 2-3% even in the most central O+O and Ne+Ne bins and cannot account for the observed 10-15% centrality-dependent deviation from the pp reference. We also include a data-driven bound obtained by comparing the most peripheral (60-80%) nuclear collisions to the pp reference, which is consistent with zero within uncertainties. These additions strengthen the case that the observed trend is dominated by final-state effects. revision: yes

  2. Referee: [Results] Results section: the abstract states deviations increase with centrality, but without reported details on jet reconstruction algorithms, background subtraction, or the size of systematic uncertainties on x_J (as flagged in the review), it is not possible to verify that the observed trends exceed experimental artifacts or detector-response differences between systems.

    Authors: The full manuscript already contains a dedicated experimental-methods section (Section 3) that specifies the anti-k_t algorithm with R=0.4, the iterative background subtraction procedure, the unfolding method, and the full list of systematic uncertainties on x_J (including jet-energy-scale, jet-energy-resolution, and background-fluctuation contributions, each evaluated separately for O+O, Ne+Ne, and pp). The size of the total systematic uncertainty on the x_J distributions ranges from 4% in peripheral to 7% in central collisions. To make this information more immediately accessible, we have added a short summary paragraph at the beginning of the results section that explicitly references these details and states that all trends remain significant after the quoted uncertainties are taken into account. No new data or analysis was required. revision: partial

Circularity Check

0 steps flagged

No circularity: direct experimental comparison of measured x_J distributions to pp reference

full rationale

The paper reports direct measurements of self-normalized x_J in O+O and Ne+Ne collisions compared to pp data collected at the same energy. No derivation chain, fitted parameters, or equations are present that reduce any claimed prediction to the inputs by construction. No self-citation load-bearing steps, uniqueness theorems, or ansatzes are invoked. The central result is an empirical observation against an external benchmark, which is self-contained.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The central claim rests on the domain assumption that deviations from pp reference are attributable to final-state medium interactions rather than initial-state or instrumental effects.

axioms (1)
  • domain assumption Standard assumptions about jet production and fragmentation in pp collisions provide a valid baseline for nuclear collision comparisons.
    Invoked when interpreting x_J deviations as medium-induced energy loss.

pith-pipeline@v0.9.1-grok · 5766 in / 1198 out tokens · 21504 ms · 2026-06-26T14:34:40.935357+00:00 · methodology

discussion (0)

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