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arxiv: 2607.00087 · v1 · pith:EXRGZQD3new · submitted 2026-06-30 · ✦ hep-ph · hep-ex· nucl-th

Putting Jet Substructure on Track(s)

Pith reviewed 2026-07-02 18:50 UTC · model grok-4.3

classification ✦ hep-ph hep-exnucl-th
keywords jet substructureenergy correlatorstracksfactorizationrenormalization groupcollinear logarithmsLHCQCD
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The pith

Projected energy correlators up to four points are now calculated on tracks at next-to-leading collinear logarithmic accuracy.

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

The paper establishes the first complete calculations of jet substructure observables using tracking information at the LHC. It applies factorization theorems and renormalization-group techniques to compute projected energy correlators up to four points at next-to-leading collinear logarithmic accuracy. This extends the state of the art achieved for full jets specifically to track-based measurements. A sympathetic reader would care because tracking detectors offer superior angular resolution, enabling more precise studies of energy flow within jets and better theory-experiment comparisons for searches and Standard Model measurements.

Core claim

By leveraging recent progress in factorization theorems and renormalization-group techniques developed for full jets, the paper computes projected energy correlators up to four points at next-to-leading collinear logarithmic accuracy for track-based observables. This provides the first complete calculations of jet substructure observables on tracks at the LHC, made possible by performing the appropriate projection onto tracks.

What carries the argument

Projected energy correlators, which capture multi-point correlations in jet energy flow after projection onto tracks and evolved using factorization and renormalization-group methods.

If this is right

  • Precise and systematically improvable theoretical predictions become available for track-based jet substructure observables.
  • Enhanced comparisons between theory and experiment are possible due to the angular resolution of tracking detectors.
  • New ways open to search for new physics and measure Standard Model parameters using jet substructure at higher precision.
  • Subtle correlations in the dynamics of the strong nuclear force can be studied with improved resolution.

Where Pith is reading between the lines

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

  • The same projection technique could simplify experimental analyses by reducing dependence on calorimeter energy resolution.
  • These calculations provide a benchmark for validating Monte Carlo event generators in the track sector.
  • Extending the method to other jet observables or higher point correlators follows naturally from the factorization framework.
  • Reduced theoretical uncertainties in LHC jet analyses that rely on tracking information become feasible.

Load-bearing premise

The factorization theorems and renormalization-group techniques developed for full jets apply without modification to track-based observables once the appropriate projection is performed.

What would settle it

A comparison of the calculated four-point projected energy correlator values against LHC experimental data using tracking information at the stated accuracy would directly test whether the factorization applies to tracks.

Figures

Figures reproduced from arXiv: 2607.00087 by Ian Moult, Kyle Lee, Wouter J. Waalewijn.

Figure 2
Figure 2. Figure 2: Projected N-point energy correlators on tracks at NLL (solid), compared to Pythia (dashed), for LHC kinematics. The bands show the perturbative uncertainty and uncertainty from Ω¯tr i , as described in the text. Our calculation does not describe the con￾finement transition (gray). The continued success of this program relies on the ability to measure correlators with increasingly fine an￾gular resolution, … view at source ↗
Figure 4
Figure 4. Figure 4: Projected N-point energy correlator on tracks divided by the corresponding correlator on all particles, at NLL (solid) and from Pythia (dashed). Uncertainties from scale variations and Ω¯ 1 are treated as correlated in the ratio. ent scales µH ∼ pT ≫ µJ ∼ pT R ≫ µJ ∼ pT RL. (3) Using renormalization group evolution to evolve these in￾gredients from their natural scales to a common scale, re￾sums the logari… view at source ↗
Figure 5
Figure 5. Figure 5: The two-point energy correlator on tracks for different mix [PITH_FULL_IMAGE:figures/full_fig_p004_5.png] view at source ↗
Figure 2
Figure 2. Figure 2: Here we show our predictions at NLL accuracy, [PITH_FULL_IMAGE:figures/full_fig_p004_2.png] view at source ↗
read the original abstract

One of the main advances in analysis strategies at the Large Hadron Collider (LHC) has been the ability to study the detailed structure of energy flow within high transverse momentum jets, a field referred to as jet substructure. Jet substructure has provided new ways to search for new physics, measure Standard Model parameters, and study the dynamics of the strong nuclear force. To push to the next level of precision, and to make measurements of increasingly subtle correlations, requires exquisite angular resolution achieved through the use of tracking information. In this paper we leverage recent progress in our understanding of factorization theorems and renormalization group techniques to present the first complete calculations of jet substructure observables at the LHC on tracks. We compute projected energy correlators up to four points at next-to-leading collinear logarithmic accuracy, matching the state of the art for jet substructure observables, but extending to tracks. This marks a significant step in enhancing the collider physics program, enabling precise and systematically improvable comparisons between experimental measurements and theoretical calculations, made possible by the exceptional angular resolution of tracking.

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 manuscript claims to present the first complete calculations of jet substructure observables on tracks by computing projected energy correlators up to four points at next-to-leading collinear logarithmic accuracy, achieved by applying existing factorization theorems and renormalization-group techniques to track-based projections.

Significance. If the central results hold, this work would extend the state of the art for energy correlators from full jets to track observables, enabling systematically improvable theoretical predictions that match the angular resolution of LHC tracking detectors and supporting more precise measurements of jet substructure.

major comments (2)
  1. [derivation of track projection] The section deriving the track projection (near the discussion of leveraging recent factorization progress): the assertion that existing collinear factorization theorems and RG evolution apply without modification requires an explicit demonstration that the projection operator commutes with the collinear splitting functions and does not generate additional logarithmic enhancements or alter the anomalous dimensions at NLL accuracy; the skeptic concern that track sampling of only charged particles could introduce uncontrolled power corrections or modify the effective jet function is not addressed by a concrete check against known limits.
  2. [four-point correlator calculation] The calculation of the four-point projected correlator: without an error estimate or validation step showing reduction to the known full-jet result in the limit where track and calorimeter information coincide, the claim of matching NLL accuracy for tracks remains unverified.
minor comments (2)
  1. [Abstract] The abstract states the accuracy level but does not define the precise projection operator or list the relevant equations; adding a short equation reference would improve clarity.
  2. [main text] Notation for the track projection operator is introduced without a dedicated equation number in the main text; consistent labeling would aid readability.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their careful reading of the manuscript and for providing constructive comments that will help improve the clarity and rigor of our presentation. We address each of the major comments below.

read point-by-point responses
  1. Referee: The section deriving the track projection (near the discussion of leveraging recent factorization progress): the assertion that existing collinear factorization theorems and RG evolution apply without modification requires an explicit demonstration that the projection operator commutes with the collinear splitting functions and does not generate additional logarithmic enhancements or alter the anomalous dimensions at NLL accuracy; the skeptic concern that track sampling of only charged particles could introduce uncontrolled power corrections or modify the effective jet function is not addressed by a concrete check against known limits.

    Authors: We agree that an explicit demonstration of the commutation between the track projection operator and the collinear splitting functions would strengthen the manuscript. Although the projection is a linear operator that acts on the energy flow and preserves the leading-power collinear factorization at NLL, we will add a dedicated paragraph or short appendix in the revised version that explicitly verifies this property, shows that no additional logarithmic enhancements are generated, and provides a concrete check in a known limit to address concerns about power corrections from sampling only charged particles. revision: yes

  2. Referee: The calculation of the four-point projected correlator: without an error estimate or validation step showing reduction to the known full-jet result in the limit where track and calorimeter information coincide, the claim of matching NLL accuracy for tracks remains unverified.

    Authors: The four-point correlator is obtained by applying the same track projection consistently within the existing factorization framework used for lower-point functions. To verify the NLL accuracy, we will include in the revision an explicit validation step, such as taking the limit where the track efficiency approaches one, demonstrating numerical or analytical reduction to the known full-jet result, and providing an associated error estimate. revision: yes

Circularity Check

0 steps flagged

No significant circularity in derivation chain

full rationale

The paper applies established factorization theorems and RG evolution (developed for full jets) to track projections via an operator, presenting explicit NLL calculations for up to four-point correlators as an extension. No quoted step reduces a prediction to a fitted parameter by construction, renames a known result, or relies on a load-bearing self-citation whose content is itself unverified within the paper. The derivation remains self-contained against external benchmarks.

Axiom & Free-Parameter Ledger

0 free parameters · 2 axioms · 0 invented entities

The calculation rests on standard QCD factorization theorems and renormalization-group evolution applied to track projections; no new free parameters, invented entities, or ad-hoc axioms are introduced in the abstract.

axioms (2)
  • domain assumption Factorization theorems separate hard, collinear, and soft contributions for jet substructure observables
    Invoked to justify the calculation framework for both full jets and tracks
  • standard math Renormalization-group techniques resum collinear logarithms to NLL accuracy
    Used to achieve the stated perturbative accuracy

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discussion (0)

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Reference graph

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