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arxiv: 2606.18143 · v1 · pith:QFRSOCI2new · submitted 2026-06-16 · ⚛️ nucl-ex

Energy-energy correlators in p-Pb collisions at sqrt{s_(rm NN)} = 5.02 TeV

ALICE Collaboration This is my paper

Pith reviewed 2026-06-26 21:39 UTC · model grok-4.3

classification ⚛️ nucl-ex
keywords energy-energy correlatorjetsp-Pb collisionscold nuclear matter effectsjet substructureALICE
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The pith

The two-point energy-energy correlator in p-Pb jets shows an enhancement at large angles and suppression at small angles relative to pp collisions in the 20-40 GeV/c range.

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

The paper reports the first measurement of the two-point energy-energy correlator inside charged-particle jets in p-Pb collisions at 5.02 TeV. This observable tracks how energy is distributed at different angles inside jets and is compared directly to a pp reference at the same energy. A clear difference appears only in the lowest jet momentum bin, with more energy flowing to wide angles and less to narrow angles in the nuclear collision system. The size of the difference varies with jet momentum, rapidity, and forward activity. The result supplies direct experimental input on cold nuclear matter effects that must be understood before interpreting jet modifications in heavy-ion data.

Core claim

The two-point energy-energy correlator measured inside charged-particle jets in p-Pb collisions at √s_NN = 5.02 TeV exhibits a modification relative to pp collisions at the same energy, specifically in the 20-40 GeV/c jet transverse momentum interval, consisting of an enhancement at large opening angles and a suppression at small angles; this difference is studied as a function of jet pT, rapidity, and forward activity to constrain cold nuclear matter effects.

What carries the argument

The two-point energy-energy correlator (EEC), an infrared- and collinear-safe measure of angular energy flow within jets.

If this is right

  • The observed modification depends on jet transverse momentum.
  • The size of the difference also varies with jet rapidity and forward activity.
  • The results supply new experimental constraints on cold nuclear matter effects in jet structure.
  • These constraints are relevant for separating initial-state and final-state contributions when interpreting EEC data in heavy-ion collisions.

Where Pith is reading between the lines

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

  • If the same angular pattern appears in other jet substructure observables, it would suggest a broad impact of cold nuclear matter on jet evolution.
  • Measurements at different collision energies could test whether the modification scales with the available center-of-mass energy per nucleon.
  • The rapidity and forward-activity dependence offers a handle to separate effects from the nuclear wave function versus final-state interactions.

Load-bearing premise

The pp reference at the same center-of-mass energy supplies an accurate baseline free of nuclear effects and all detector, reconstruction, and unfolding corrections have been applied identically in both systems.

What would settle it

A new or re-unfolded measurement of the EEC distributions in pp collisions at 5.02 TeV that agrees with the p-Pb distributions within uncertainties in the 20-40 GeV/c interval would falsify the reported modification.

Figures

Figures reproduced from arXiv: 2606.18143 by ALICE Collaboration.

Figure 1
Figure 1. Figure 1: Top: The fully corrected ΣEEC in p–Pb and pp collisions as a function of RL in 20–40, 40–60, and 60–80 GeV/c jets. Bottom: The ratio of ΣEEC in p–Pb to pp. Systematic uncertainties are shown with shaded boxes around the data points. Note that this does not change the jet pT, as that value is always determined using tracks with pT ≥ 150 MeV/c [PITH_FULL_IMAGE:figures/full_fig_p008_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: Top: The fully corrected ΣEEC in p–Pb collisions as a function of RL, with a varying pT,track threshold (150 MeV/c, 1 GeV/c, and 2 GeV/c), in 20–40, 40–60, and 60–80 GeV/c jets. Bottom: The ratio of ΣEEC in p–Pb to pp with different pT,track thresholds, where in the pp reference the pT,track threshold is also varied. Systematic uncertainties are shown with shaded boxes around the data points. RL 0.5 1 1.5 … view at source ↗
Figure 3
Figure 3. Figure 3: Top: The fully corrected ΣEEC in p–Pb and pp collisions as a function of RL, in 20–27, 27–40, and 40–80 GeV/c jets. Bottom: The ratio of ΣEEC in p–Pb to pp. Systematic uncertainties are shown with shaded boxes around the data points. (−0.5 < ηjet < 0). The ΣEEC p−going/ΣEEC Pb−going ratio is shown in the upper panel of [PITH_FULL_IMAGE:figures/full_fig_p009_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: Top: The ratio of p-going (ηjet < 0) to Pb-going (ηjet > 0) ΣEEC in 20–40 GeV/c p–Pb jets. Bottom: The ratio of ΣEEC in high-multiplicity events (0–5% V0A) to ΣEEC in low-multiplicity events (5–100% V0A), in 20–40 GeV/c p–Pb jets. 5.3 Studying the transition region In pp collisions, it was found that the EEC aligns with pQCD calculations in the large RL region, and with free hadron scaling in the small RL … view at source ↗
Figure 5
Figure 5. Figure 5: The normalized ΣEEC as a function of ⟨p ch jet T ⟩RL. The logarithm ln⟨p ch jet T ⟩ represents ln(⟨p ch jet T ⟩/(GeV/c)). The dashed grey line corresponds to the maximum location of the distribution and the grey band corresponds to a ±0.07 GeV/c uncertainty along the x-axis. are shown in [PITH_FULL_IMAGE:figures/full_fig_p011_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: The ratio of p–Pb to pp ΣEEC in 20–40 GeV/c jets, with comparison to PYTHIA with nPDF (red) [80] and PYTHIA Angantyr (blue) [81]. 6 Conclusions This paper reports the first measurement of the two-point energy–energy correlator inside R = 0.4 anti-kT charged-particle jets in p–Pb collisions at √ sNN = 5.02 TeV. New background-subtracted measurements of the EEC in pp collisions at √ s = 5.02 TeV are also sho… view at source ↗
Figure 7
Figure 7. Figure 7: The ratio of p–Pb to pp ΣEEC in 20–40 GeV/c jets, with comparison to theoretical models with co￾movers [45], pT broadening [44], and twist-4 OPE corrections [25]. the EEC in p–Pb collisions agrees with the pp baseline within uncertainties. In the 20–40 GeV/c interval, however, an enhancement is observed at large RL and a suppression at small RL, indicating a modification of the angular distribution of ener… view at source ↗
read the original abstract

This paper presents the first measurement of the two-point energy-energy correlator (EEC) inside charged-particle jets in p-Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV with the ALICE experiment. The two-point EEC, an infrared- and collinear-safe measure of angular energy flow within jets, is used to probe both perturbative and non-perturbative stages of the jet evolution. The EEC is reported in 20-80 GeV/$c$ jets in p-Pb collisions and compared to a measurement of the EEC in pp events at $\sqrt{s} = 5.02$ TeV. A modification is observed in the 20-40 GeV/$c$ interval, with an enhancement at large opening angles and a suppression at small angles relative to pp collisions. The dependence of this modification on jet transverse momentum, rapidity, and forward activity is investigated. These results provide new constraints on cold nuclear matter effects relevant for disentangling initial- and final-state contributions to jet-structure modifications. An understanding of these cold nuclear matter effects is also relevant for interpreting EEC measurements in heavy-ion collisions.

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

0 major / 3 minor

Summary. The manuscript reports the first measurement of the two-point energy-energy correlator (EEC) inside charged-particle jets in p-Pb collisions at √s_NN = 5.02 TeV using the ALICE detector. The EEC is measured for jets in the 20-80 GeV/c range and compared to a pp reference at the same center-of-mass energy per nucleon, with a modification observed specifically in the 20-40 GeV/c interval (enhancement at large angles, suppression at small angles). Dependencies on jet p_T, rapidity, and forward activity are also examined to constrain cold-nuclear-matter effects.

Significance. If the reported difference is robust, the result supplies a valuable experimental baseline for cold-nuclear-matter modifications to jet substructure using an infrared- and collinear-safe observable. This is directly relevant for interpreting EEC measurements in heavy-ion collisions and for separating initial- from final-state effects. The direct comparison to a pp data set at matching √s is the conventional approach and avoids circularity.

minor comments (3)
  1. The abstract states that the pp reference is at √s = 5.02 TeV; the manuscript should explicitly confirm in the methods section that the identical jet-finding, track selection, and unfolding procedures were applied to both systems (as implied by the comparison).
  2. Figure captions and text should clarify the precise definition of the EEC observable (e.g., the normalization and the angular variable range) to allow direct comparison with future theoretical calculations.
  3. The dependence on forward activity is mentioned; a brief statement on how the centrality or multiplicity estimator is defined and whether it correlates with the observed modification would improve clarity.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for the positive assessment of our manuscript, the recognition of its significance as the first EEC measurement in p-Pb collisions, and the recommendation for minor revision. No major comments were raised in the report.

Circularity Check

0 steps flagged

No significant circularity

full rationale

This is a direct experimental measurement of the two-point energy-energy correlator in charged-particle jets in p-Pb collisions, compared to a separate pp reference dataset at matching per-nucleon energy. The reported modification is an observational result obtained via standard detector corrections, unfolding, and identical analysis procedures applied to both systems; no equations, ansatze, or fitted parameters are derived that reduce by construction to the inputs. The pp baseline is an independent measurement, not a self-referential fit. The derivation chain is therefore self-contained against external data benchmarks with no load-bearing self-citation loops or definitional circularity.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

Experimental measurement paper. No free parameters, axioms, or invented entities are introduced; the result rests on the validity of standard ALICE jet reconstruction, unfolding, and background subtraction procedures that are not detailed in the abstract.

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