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arxiv: 1111.6097 · v1 · submitted 2011-11-25 · ✦ hep-ph · hep-ex

FastJet user manual

Matteo Cacciari , Gavin P. Salam , Gregory Soyez This is my paper

Pith reviewed 2026-05-13 05:19 UTC · model grok-4.3

classification ✦ hep-ph hep-ex
keywords jet algorithmsjet findingC++ packageparticle physicscollider data analysisjet substructurepileup subtraction
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0 comments X

The pith

FastJet is a C++ package that provides efficient implementations of all widely used jet algorithms for particle physics.

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

The paper describes FastJet, a software tool for identifying and analyzing jets in data from particle colliders. It implements sequential recombination algorithms natively for both proton-proton and electron-positron collisions while supporting additional algorithms via plugins. The package further supplies utilities for examining jet substructure, estimating background noise from pileup, and subtracting that noise from jets. Physicists would find this useful because jets are key observables in high-energy collision experiments and their accurate reconstruction affects many measurements.

Core claim

FastJet is a C++ package that provides a broad range of jet finding and analysis tools. It includes efficient native implementations of all widely used 2-to-1 sequential recombination jet algorithms for pp and e+e- collisions, as well as access to 3rd party jet algorithms through a plugin mechanism, including all currently used cone algorithms. FastJet also provides means to facilitate the manipulation of jet substructure, including some common boosted heavy-object taggers, as well as tools for estimation of pileup and underlying-event noise levels, determination of jet areas and subtraction or suppression of noise in jets.

What carries the argument

The FastJet C++ library, which unifies implementations of jet reconstruction algorithms and provides supporting analysis tools for substructure and background handling.

If this is right

  • Users gain access to multiple jet algorithms through a consistent interface without needing separate codes for each.
  • The plugin system allows incorporation of cone algorithms and other third-party methods.
  • Substructure manipulation tools enable tagging of boosted heavy objects within jets.
  • Noise estimation and subtraction features support cleaner jet measurements in high-pileup environments.

Where Pith is reading between the lines

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

  • Switching between jet definitions within one framework could simplify comparisons of results from different algorithms.
  • The area-based subtraction methods may allow more precise removal of underlying event contributions in complex collision events.
  • Availability of these tools in a single package could reduce development time for new physics analyses.

Load-bearing premise

The package correctly and efficiently implements the described jet algorithms and analysis methods as claimed.

What would settle it

Running the package on benchmark events with known jet configurations and comparing outputs to independent calculations of the same algorithms would reveal any implementation errors.

read the original abstract

FastJet is a C++ package that provides a broad range of jet finding and analysis tools. It includes efficient native implementations of all widely used 2-to-1 sequential recombination jet algorithms for pp and e+e- collisions, as well as access to 3rd party jet algorithms through a plugin mechanism, including all currently used cone algorithms. FastJet also provides means to facilitate the manipulation of jet substructure, including some common boosted heavy-object taggers, as well as tools for estimation of pileup and underlying-event noise levels, determination of jet areas and subtraction or suppression of noise in jets.

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 is the user manual for the FastJet C++ package. It describes the software's provision of efficient native implementations of all widely used 2-to-1 sequential recombination jet algorithms for pp and e+e- collisions, a plugin mechanism for third-party algorithms (including all current cone algorithms), tools to facilitate jet substructure manipulation (including common boosted heavy-object taggers), and utilities for estimating pileup and underlying-event noise levels, determining jet areas, and performing noise subtraction or suppression in jets.

Significance. As a comprehensive user manual for a widely adopted tool in high-energy physics, this document is significant for enabling correct and reproducible use of jet reconstruction algorithms in experimental analyses at facilities such as the LHC. The coverage of both standard clustering methods and advanced techniques like substructure tagging and area-based pileup mitigation directly supports ongoing research needs in jet physics.

minor comments (3)
  1. [Abstract] The abstract states that the package provides 'efficient native implementations' but does not include any performance benchmarks, timing comparisons, or verification tests; while not load-bearing for a user manual, adding a brief reference to such metrics (or to a companion paper) would strengthen user confidence in the efficiency claims.
  2. The document would benefit from an explicit statement of the software version number and release date to allow users to match the manual to their installed package.
  3. A dedicated section listing recommended citations for both the FastJet library and the manual itself would aid proper attribution in publications.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for their thorough review and positive recommendation to accept the manuscript. The referee's summary accurately captures the scope and purpose of the FastJet user manual.

Circularity Check

0 steps flagged

No significant circularity: user manual with no derivations or predictions

full rationale

The document is a software user manual whose content consists of factual descriptions of package capabilities, algorithm implementations, usage instructions, and API details. No physical derivations, quantitative predictions, fitted parameters, or mathematical claims are advanced. The central claim (provision of native sequential recombination algorithms, plugins, substructure tools, and pileup handling) is a direct statement of software features and does not rely on any internal chain of reasoning, self-citation, or ansatz that could reduce to its own inputs. As a self-contained documentation artifact, it has no load-bearing steps amenable to circularity analysis.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

No new scientific claims, derivations, or postulates are made; this is software documentation, so the ledger is empty.

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discussion (0)

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