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arxiv: 2606.13077 · v1 · pith:2ZH5PPPRnew · submitted 2026-06-11 · ✦ hep-ph

A generalised-k_t jet algorithm for Deep Inelastic Scattering

Pith reviewed 2026-06-27 06:43 UTC · model grok-4.3

classification ✦ hep-ph
keywords jet algorithmDeep Inelastic ScatteringBreit framegeneralised k_tstruck quarkhadronisationCentauro algorithm
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The pith

An inclusive generalised-k_t jet algorithm for Deep Inelastic Scattering is defined in the Breit frame to identify the struck quark jet.

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

The paper introduces a family of inclusive jet algorithms for Deep Inelastic Scattering that generalize the k_t clustering with a tunable parameter p controlling transverse-momentum weighting. These algorithms are formulated in the Breit frame and include a jet radius R. The authors examine their use for tagging the jet from the struck quark, measure sensitivity to hadronisation, and compare performance against the Centauro algorithm. The p=0 angular-ordered member of the family already supports observables with simple all-order perturbative structure.

Core claim

The authors introduce an inclusive generalised-k_t jet algorithm defined in the Breit frame, governed by the usual parameter p and a jet radius R, and implemented in fjcontrib. The angular-ordered p=0 version can formulate observables with simple all-order structures. The work investigates phenomenological applications to struck-quark jet identification and evaluates sensitivity to non-perturbative effects such as hadronisation, with explicit comparisons to the Centauro algorithm.

What carries the argument

The generalised-k_t clustering algorithm with parameter p, defined in the Breit frame for DIS events.

If this is right

  • The p=0 member permits observables whose all-order structure remains simple.
  • The algorithms can be applied directly to tag the jet associated with the struck quark.
  • Their response to hadronisation can be quantified and compared with existing methods.
  • Direct comparisons with the Centauro algorithm become possible within the same framework.

Where Pith is reading between the lines

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

  • The Breit-frame definition may reduce frame-choice ambiguities that affect jet reconstruction in other DIS analyses.
  • Varying p continuously could allow optimisation of jet tagging efficiency versus background rejection in precision DIS measurements.
  • Availability in fjcontrib makes the family immediately usable inside standard parton-shower generators for further validation studies.

Load-bearing premise

Defining the algorithm in the Breit frame and extending the p=0 case to general p yields useful phenomenological improvements for struck-quark jet identification.

What would settle it

A side-by-side comparison on the same DIS Monte Carlo samples in which the new algorithms show no gain in struck-quark jet purity or no reduction in hadronisation uncertainty relative to the Centauro algorithm.

Figures

Figures reproduced from arXiv: 2606.13077 by Alexander Karlberg, Darcy Peake, Melissa van Beekveld, Silvia Ferrario Ravasio.

Figure 1
Figure 1. Figure 1: Normalised Breit-frame energy distribution of the final-state macrojet [PITH_FULL_IMAGE:figures/full_fig_p010_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: From left to right, we show the jet and jet boundaries for the [PITH_FULL_IMAGE:figures/full_fig_p012_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: The z − η-plane for all jets constructed with the Centauro (pink), C/A (orange), kt (green) and anti-kt (blue) algorithms for R0 = 2/3 (left) and R0 = 1 (right), using Eq. (24). The solid (dashed) curves correspond to 68% (95%) of the jets, in terms of their density in the z − η-plane. tends to produce smaller jets with similar-sized jet radius parameter R0. This is a con￾sequence of a general property of … view at source ↗
Figure 4
Figure 4. Figure 4: Normalised energy distribution of the final-state macrojet in the Breit [PITH_FULL_IMAGE:figures/full_fig_p014_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: Similar to Fig [PITH_FULL_IMAGE:figures/full_fig_p015_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: Normalised energy (first row), zjet (second row) and qT (third row) dis￾tributions of the final-state macrojet in the Breit frame for the C/A (first column), kt (second column), anti-kt (third column), and Centauro (fourth column) jet al￾gorithms, with R0 = 2/3. We show results at the parton shower level (labeled PS, dotted), parton shower with beam remnants (labeled PS+remn, dashed), and parton shower wit… view at source ↗
read the original abstract

We introduce an inclusive generalised-$k_t$ jet algorithm for Deep Inelastic Scattering, defined in the Breit frame and implemented in fjcontrib. The family of algorithms is governed by the usual parameter $p$, which controls the transverse-momentum dependence of the algorithm, as well as by a jet radius parameter $R$. The angular-ordered ($p=0$) version of the algorithm was already presented by some of us, and can be used to formulate observables with simple all-order structures. In this article we investigate phenomenological applications of the algorithms related to the identification of the jet associated with the struck quark, and assess their sensitivity to non-perturbative effects, such as hadronisation. We also perform comparisons with the recent Centauro algorithm.

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 paper introduces an inclusive generalised-k_t jet algorithm for Deep Inelastic Scattering defined in the Breit frame, governed by the usual parameter p (controlling transverse-momentum dependence) and jet radius R, and implemented in fjcontrib. It extends prior work on the angular-ordered (p=0) case, which admits simple all-order structures, and performs a phenomenological investigation of struck-quark jet identification, sensitivity to non-perturbative effects such as hadronisation, and comparisons with the Centauro algorithm.

Significance. The public implementation in fjcontrib is a clear strength that enables reproducible use by the community. If the phenomenological studies demonstrate concrete advantages in struck-quark tagging or reduced non-perturbative sensitivity relative to existing algorithms, the work would supply a practical tool for precision jet analyses in DIS at facilities such as the EIC.

minor comments (3)
  1. [Abstract] The abstract states that the algorithms are investigated for struck-quark jet identification and non-perturbative sensitivity, but the manuscript should explicitly state the quantitative figures of merit (e.g., tagging efficiency, purity, or hadronisation corrections) used to reach conclusions.
  2. Ensure that all plots comparing the new algorithm family to Centauro include error bands or statistical uncertainties so that differences can be assessed for significance.
  3. Notation for the distance measure in the generalised-k_t clustering should be written out explicitly once in the main text (even if standard) to aid readers unfamiliar with the p-parameter family.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for their report, positive assessment of the work, and recommendation for minor revision. No major comments were raised.

Circularity Check

0 steps flagged

No circularity: algorithmic definition, not a derived prediction

full rationale

The paper's core contribution is the explicit definition of a generalised-k_t family (parameter p and radius R) in the Breit frame for inclusive DIS jet finding, together with its implementation. This is a constructive act rather than a derivation whose outputs reduce to its inputs by construction. The p=0 case is cited as prior work by overlapping authors, but the extension to general p and the phenomenological study are presented as new; neither relies on a fitted parameter renamed as a prediction nor on a self-citation chain that forbids alternatives. No equations or claims in the provided text exhibit self-definitional, fitted-input, or uniqueness-imported circularity.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

Abstract-only review provides no information on free parameters, axioms, or invented entities; the algorithm parameters p and R are user inputs rather than fitted quantities.

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discussion (0)

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Forward citations

Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Centauric 1-Jettiness in DIS and Universal Power Corrections

    hep-ph 2026-06 unverdicted novelty 7.0

    Introduces Centauric 1-jettiness in DIS, derives N3LL resummation matched to NLO, and establishes universal non-perturbative power corrections scaling as 1/R via reduction to rescaled hemisphere soft function.

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