NNLOJET: a parton-level event generator for jet cross sections at NNLO QCD accuracy

A. Gehrmann-De Ridder; A. Huss; A. Rodriguez Garcia; C. T. Preuss; D. Walker; E. Fox; E.W.N. Glover; F. Lorkowski; F. Merlotti; G. Fontana

arxiv: 2503.22804 · v2 · submitted 2025-03-28 · ✦ hep-ph

NNLOJET: a parton-level event generator for jet cross sections at NNLO QCD accuracy

A. Huss , L. Bonino , O. Braun-White , S. Caletti , X. Chen , J. Cruz-Martinez , J. Currie , Y.S. Dai

show 32 more authors

W. Feng G. Fontana E. Fox R. Gauld A. Gehrmann-De Ridder T. Gehrmann E.W.N. Glover M. H\"ofer P. Jakub\v{c}\'ik M. Jaquier M. L\"ochner F. Lorkowski I. Majer M. Marcoli P. Meinzinger F. Merlotti J. Mo T. Morgan J. Niehues J. Pires C. T. Preuss A. Rodriguez Garcia K. Sch\"onwald R. Sch\"urmann V. Sotnikov G. Stagnitto H.T. Sun D. Walker S. Wells J. Whitehead T.Z. Yang H. Zhang

This is my paper

Pith reviewed 2026-05-22 21:55 UTC · model grok-4.3

classification ✦ hep-ph

keywords NNLOJETantenna subtractionNNLO QCDjet cross sectionsparton-level event generatorQCD calculationscollider observables

0 comments

The pith

NNLOJET implements the antenna subtraction method to compute jet cross sections at NNLO QCD accuracy for electron-positron, lepton-hadron and hadron-hadron collisions.

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

The paper presents an implementation of the antenna subtraction method for next-to-next-to-leading order QCD calculations inside the NNLOJET parton-level event generator. This code now produces jet cross sections and related observables across electron-positron, lepton-hadron, and hadron-hadron collisions. The authors also document the open-source code and its usage. A reader would care because these calculations supply the precision needed to compare theory with data from particle colliders.

Core claim

The antenna subtraction method for NNLO QCD calculations is implemented in the NNLOJET parton-level event generator code to compute jet cross sections and related observables in electron-positron, lepton-hadron and hadron-hadron collisions. We describe the open-source NNLOJET code and its usage.

What carries the argument

NNLOJET, a parton-level event generator that carries the antenna subtraction method to cancel infrared divergences at NNLO in QCD jet calculations.

If this is right

Jet cross sections become available at NNLO accuracy for electron-positron collisions.
Lepton-hadron and hadron-hadron jet processes can be treated at the same order.
Related observables beyond total cross sections can be extracted from the generator.
The open-source release permits direct use and verification by other groups.

Where Pith is reading between the lines

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

The generator may be extended to additional processes that require NNLO corrections.
Phenomenological studies could incorporate these results to tighten constraints on parton distributions.
Direct interfacing with experimental frameworks may become more straightforward.

Load-bearing premise

The antenna subtraction method can be correctly and completely implemented within a parton-level event generator framework for the listed collision types without unstated limitations on phase space or observables.

What would settle it

NNLOJET output for a benchmark jet cross section that differs from an independent NNLO calculation or from experimental data by more than the combined numerical and experimental uncertainties.

read the original abstract

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.

Desk Editor's Note private letter to a colleague

NNLOJET is an open-source code release that packages antenna subtraction for NNLO jet calculations across e+e-, lepton-hadron, and hadron-hadron collisions.

read the letter

NNLOJET is an open-source code release that packages antenna subtraction for NNLO jet calculations across e+e-, lepton-hadron, and hadron-hadron collisions. The main contribution is making this established method available as a parton-level event generator for jet cross sections and related observables. That matters for precision work at colliders, where NNLO accuracy is now standard and event-level output helps with direct experimental comparisons and uncertainty estimates. The abstract positions the code as covering the main collision types without obvious restrictions stated upfront. Open-source release is a clear practical step that lets others use or inspect the implementation. The paper does what it sets out to do on the surface by describing the code and its intended usage. The soft spot is that only the abstract is available here. No sample results, validation plots, phase-space tests, or comparisons to prior calculations appear in the text we have. Without those, it is not possible to judge how complete the implementation is or whether any hidden limitations exist on observables or kinematics. The central claim itself looks straightforward and free of obvious circularity, but the supporting evidence is not visible. This paper is aimed at phenomenologists and experimental groups who need NNLO jet tools for hadron collider studies. A reader looking for a ready-to-use generator at this order would get direct value from knowing the code exists. It deserves a serious referee because tool releases at NNLO can affect how the field does calculations, even if the review would need to focus on benchmarks and reproducibility once the full text is in hand. I would send it to peer review rather than desk reject.

Referee Report

1 major / 0 minor

Summary. The manuscript claims that the antenna subtraction method for NNLO QCD calculations has been implemented in the NNLOJET parton-level event generator code. This enables computation of jet cross sections and related observables in electron-positron, lepton-hadron, and hadron-hadron collisions. The paper also describes the open-source NNLOJET code and its usage.

Significance. If the implementation is correct, complete, and validated across the claimed processes, the work would provide a valuable open-source tool for NNLO QCD phenomenology. The explicit release of NNLOJET as open-source code supports reproducibility and community use. Coverage of multiple collider types (e+e-, lepton-hadron, hadron-hadron) would broaden applicability for precision jet observables. However, the provided manuscript contains no numerical results, benchmarks, or implementation details, so the practical significance cannot be assessed.

major comments (1)

[Abstract] Abstract: The central claim states that the antenna subtraction method 'is implemented' for jet cross sections in e+e-, lepton-hadron, and hadron-hadron collisions, yet the manuscript supplies no equations, algorithmic descriptions, phase-space restrictions, or validation data. This prevents evaluation of whether the implementation is complete and free of unstated limitations on observables or kinematics, which is load-bearing for the claim.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for their report on our manuscript. We address the major comment below.

read point-by-point responses

Referee: [Abstract] Abstract: The central claim states that the antenna subtraction method 'is implemented' for jet cross sections in e+e-, lepton-hadron, and hadron-hadron collisions, yet the manuscript supplies no equations, algorithmic descriptions, phase-space restrictions, or validation data. This prevents evaluation of whether the implementation is complete and free of unstated limitations on observables or kinematics, which is load-bearing for the claim.

Authors: We agree that the manuscript as provided consists only of the abstract and therefore contains none of the requested technical details, equations, or validation. This prevents a full assessment of completeness or limitations from the text alone. The manuscript's scope is a brief announcement of the open-source NNLOJET code release and the processes it targets. To address this, we will revise the manuscript to include references to the prior literature on the antenna subtraction method at NNLO, a short overview of its implementation structure in the code, and explicit statements on the observables and kinematic ranges covered. revision: yes

Circularity Check

0 steps flagged

No circularity; abstract states implementation without derivations or self-referential steps

full rationale

The paper text is limited to a single abstract paragraph that describes the implementation of an existing method (antenna subtraction) in a code (NNLOJET) for computing observables. No equations, parameter fits, derivations, uniqueness theorems, or citations appear in the provided text, so no load-bearing step can be shown to reduce to its own inputs by construction. This is the expected outcome for a descriptive abstract with no technical content.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

Abstract-only review; no information on free parameters, axioms, or invented entities is available.

pith-pipeline@v0.9.0 · 5740 in / 975 out tokens · 22612 ms · 2026-05-22T21:55:37.204613+00:00 · methodology

discussion (0)

Lean theorems connected to this paper

Citations machine-checked in the Pith Canon. Every link opens the source theorem in the public Lean library.

IndisputableMonolith/Cost/FunctionalEquation.lean washburn_uniqueness_aczel unclear

?

unclear
Relation between the paper passage and the cited Recognition theorem.

The antenna subtraction method for NNLO QCD calculations is implemented in the NNLOJET parton-level event generator code to compute jet cross sections...
IndisputableMonolith/Foundation/AlexanderDuality.lean alexander_duality_circle_linking unclear

?

unclear
Relation between the paper passage and the cited Recognition theorem.

NNLOJET phase-space integration is based on optimized parametrizations... integrated using the adaptive Monte Carlo routine VEGAS

What do these tags mean?

matches: The paper's claim is directly supported by a theorem in the formal canon.
supports: The theorem supports part of the paper's argument, but the paper may add assumptions or extra steps.
extends: The paper goes beyond the formal theorem; the theorem is a base layer rather than the whole result.
uses: The paper appears to rely on the theorem as machinery.
contradicts: The paper's claim conflicts with a theorem or certificate in the canon.
unclear: Pith found a possible connection, but the passage is too broad, indirect, or ambiguous to say the theorem truly supports the claim.

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