PineAPPLv1: fast and flexible theory predictions for present and future colliders
Pith reviewed 2026-06-27 03:02 UTC · model grok-4.3
The pith
PineAPPLv1 supplies interpolation tables that support convolutions with any number of polarised and unpolarised PDFs and FFs, including mixed space-like and time-like evolution.
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
Core claim
PineAPPLv1 stores interpolation coefficients in a grid format that encodes partonic cross sections for an arbitrary number of convolutions with initial- and final-state particles of any polarisation; the library simultaneously accepts polarised and unpolarised distributions obeying space-like or time-like evolution and permits independent scale variations for each hard scale in the process.
What carries the argument
The new representation of interpolation coefficients stored in the grid, which encodes the partonic cross sections so they can be convolved with multiple PDFs and FFs of mixed polarisation and evolution type.
If this is right
- Predictions for single-inclusive pion production can be obtained with simultaneous PDF, FF and scale uncertainties in both unpolarised and polarised proton-proton collisions.
- The same framework supplies predictions for semi-inclusive deep-inelastic scattering that include fragmentation functions together with PDFs.
- Control over independent scale choices becomes available whenever a scattering process is characterised by more than one hard scale.
- An arbitrary number of convolutions is supported, even though typical processes use only a few.
Where Pith is reading between the lines
- Global fits that combine many observables could incorporate additional final-state fragmentation data at negligible extra cost.
- Processes at future high-energy colliders that involve several identified hadrons in the final state could be treated uniformly within one interpolation framework.
Load-bearing premise
The interpolation tables stored in the grid accurately represent the underlying partonic cross sections for arbitrary numbers of convolutions without introducing significant numerical errors or loss of flexibility when handling mixed polarization and scale choices.
What would settle it
A side-by-side numerical comparison of PineAPPLv1 output against an exact partonic calculation for a process that requires three or more convolutions, such as double-inclusive hadron production, that shows differences exceeding the interpolation tolerance.
Figures
read the original abstract
We present PineAPPLv1, a library designed to provide accurate and flexible interpolation tables of partonic cross sections that can be convolved with parton distribution functions (PDFs) and fragmentation functions (FFs) for the fast evaluation of high-energy physical observables. The core feature of the new release is the support of multiple convolutions involving initial- and final-state hadronic particles, with any polarisation, that are associated with PDFs and FFs. The library simultaneously supports polarised and unpolarised distributions that obey space-like or time-like evolution, and is developed for an arbitrary number of them, even if physical processes typically only require a few. Control of scale choices when more than one scale characterises a scattering process is also possible. We describe the technical details of the new representation of interpolation coefficients stored in the grid, and we demonstrate the capabilities of the library in a few phenomenological cases of interest. Specifically, we compute predictions for single-inclusive pion production in unpolarised and polarised proton-proton collisions and in semi-inclusive deep-inelastic scattering. We show how, in each case, PDF, FF, and scale uncertainties compare to each other and highlight the potential of PineAPPL as an essential ingredient for precision physics at current and future colliders.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The manuscript presents PineAPPLv1, a library for generating interpolation tables of partonic cross sections that support fast convolution with PDFs and FFs. The core new capability is support for multiple convolutions involving initial- and final-state hadronic particles with arbitrary polarization, simultaneously handling polarised/unpolarised distributions obeying space-like or time-like evolution for an arbitrary number of such distributions. The paper describes the technical representation of the interpolation coefficients in the grid, control of scale choices, and demonstrates the library via single-inclusive pion production in unpolarised/polarised pp collisions and SIDIS, comparing PDF, FF, and scale uncertainties.
Significance. If the interpolation tables accurately represent the underlying partonic cross sections for arbitrary numbers of convolutions without significant numerical errors, the library would be a useful addition for precision phenomenology at present and future colliders by enabling efficient evaluation of observables with complex multi-convolution structures and mixed polarizations. The explicit demonstrations in phenomenological cases provide concrete checks of its intended use.
major comments (2)
- [Technical details of the new representation of interpolation coefficients] The description of the new grid representation (mentioned in the abstract and technical-details paragraph) does not include quantitative validation tests, numerical error budgets, or direct comparisons to independent calculations for cases with more than two convolutions or mixed polarization/evolution types. This is load-bearing for the central claim that the tables support arbitrary numbers without loss of accuracy or flexibility.
- [Phenomenological cases of interest] In the phenomenological demonstrations (single-inclusive pion production in pp and SIDIS), the comparisons focus on PDF/FF/scale uncertainties but supply no explicit checks of interpolation accuracy against known analytic or alternative numerical results for the multi-convolution scenarios.
minor comments (2)
- The abstract states the library 'is developed for an arbitrary number' of distributions; a brief statement on practical limits (e.g., memory or CPU scaling) would improve clarity.
- Consider adding a short table or paragraph contrasting supported features with the previous PineAPPL version and with other public interpolation libraries.
Simulated Author's Rebuttal
We thank the referee for their careful reading of the manuscript and for the constructive comments. We address each major comment below and indicate the revisions we will make.
read point-by-point responses
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Referee: [Technical details of the new representation of interpolation coefficients] The description of the new grid representation (mentioned in the abstract and technical-details paragraph) does not include quantitative validation tests, numerical error budgets, or direct comparisons to independent calculations for cases with more than two convolutions or mixed polarization/evolution types. This is load-bearing for the central claim that the tables support arbitrary numbers without loss of accuracy or flexibility.
Authors: We agree that explicit quantitative validation strengthens the central claim. The representation is formulated to be general for an arbitrary number of convolutions (as described in the technical section), and the phenomenological examples already include a three-convolution process (single-inclusive pion production in pp collisions) with mixed polarization. Nevertheless, we will add a new subsection containing numerical error budgets, interpolation accuracy tests, and direct comparisons to independent calculations for a triple-convolution case involving mixed polarization and evolution types. revision: yes
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Referee: [Phenomenological cases of interest] In the phenomenological demonstrations (single-inclusive pion production in pp and SIDIS), the comparisons focus on PDF/FF/scale uncertainties but supply no explicit checks of interpolation accuracy against known analytic or alternative numerical results for the multi-convolution scenarios.
Authors: The demonstrations are intended to illustrate the new multi-convolution and polarization capabilities together with the resulting uncertainty comparisons. We acknowledge that dedicated accuracy benchmarks against alternative calculations would be useful. In the revised manuscript we will include such explicit checks (e.g., against known unpolarised results or direct numerical evaluations) for the multi-convolution cases presented. revision: yes
Circularity Check
No significant circularity: software library release
full rationale
The paper presents PineAPPLv1 as a software library implementing grid-based interpolation for multi-convolution observables involving PDFs and FFs (polarized/unpolarized, space-/time-like). No mathematical derivation, fitted parameters, or predictions are claimed; the work consists of technical implementation details and phenomenological demonstrations. No load-bearing steps reduce to self-definition, self-citation chains, or fitted inputs by construction. The reader's assessment of score 0.0 is confirmed by inspection of the full text.
Axiom & Free-Parameter Ledger
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discussion (0)
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