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arxiv: 2605.31325 · v1 · pith:C5N6Z3TBnew · submitted 2026-05-29 · ✦ hep-ph · hep-ex

Revisiting Unidentified Charged-Hadron Fragmentation Functions with Modern COMPASS SIDIS Multiplicities

HAPS Collaboration: Maryam Soleymaninia , Hamzeh Khanpour , Hubert Spiesberger , Majid Azizi , Michael Klasen , Hadi Hashamipour This is my paper

Pith reviewed 2026-06-28 21:52 UTC · model grok-4.3

classification ✦ hep-ph hep-ex
keywords fragmentation functionsCOMPASS SIDISSIAQCD global analysischarged hadronsNLO NNLOlight quarksantiquarks
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The pith

Modern COMPASS SIDIS multiplicities can be consistently described with SIA data and yield charge-separated constraints on light-quark and antiquark fragmentation functions.

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

This paper performs a new global QCD analysis of unidentified charged-hadron fragmentation functions using single-inclusive electron-positron annihilation data combined with updated COMPASS semi-inclusive deep-inelastic scattering multiplicities from the 2025 proton-target measurement and the 2026 isoscalar addendum. The extraction is done at both next-to-leading order and next-to-next-to-leading order to assess perturbative stability and the impact on flavor structure. The modern COMPASS data provides important constraints on the flavor structure of the fragmentation functions, particularly separating light quarks and antiquarks. The resulting HAPS-hFF1.0 set is made publicly available in LHAPDF format.

Core claim

The modern COMPASS multiplicities can be consistently described together with the SIA data and provide important charge-separated constraints on the light-quark and antiquark FFs. The comparison between the NLO and NNLO extractions indicates a stable quark-sector determination, while the gluon FF remains less directly constrained in the present SIA+SIDIS analysis.

What carries the argument

Global QCD fit of unidentified charged-hadron fragmentation functions to SIA and modern COMPASS SIDIS multiplicities performed at NLO and NNLO.

If this is right

  • The quark-sector determination of the fragmentation functions remains stable between NLO and NNLO.
  • The gluon fragmentation function stays less directly constrained by the SIA plus SIDIS combination.
  • Modern COMPASS SIDIS multiplicities are important for precision studies of unidentified charged-hadron fragmentation.
  • Future global fragmentation function determinations will incorporate this updated charge-separated input.

Where Pith is reading between the lines

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

  • The charge-separated light-quark constraints could sharpen predictions for identified hadron yields in proton-proton collisions at colliders.
  • Adding data sensitive to gluon fragmentation, such as from heavy-flavor production, would likely reduce the current uncertainty on the gluon FF.
  • The public LHAPDF replicas enable direct testing of the extracted functions against upcoming measurements without refitting.

Load-bearing premise

The chosen parametrization and perturbative orders are sufficient to absorb all relevant higher-order and non-perturbative effects without introducing biases that would alter the extracted flavor-separated FFs.

What would settle it

A clear mismatch between the predicted multiplicities from the extracted FFs and new independent experimental data from other processes or facilities.

Figures

Figures reproduced from arXiv: 2605.31325 by Hadi Hashamipour, Hamzeh Khanpour, HAPS Collaboration: Maryam Soleymaninia, Hubert Spiesberger, Majid Azizi, Michael Klasen.

Figure 1
Figure 1. Figure 1: FIG. 1 [PITH_FULL_IMAGE:figures/full_fig_p005_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2 [PITH_FULL_IMAGE:figures/full_fig_p007_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3 [PITH_FULL_IMAGE:figures/full_fig_p008_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4 [PITH_FULL_IMAGE:figures/full_fig_p010_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: FIG. 5 [PITH_FULL_IMAGE:figures/full_fig_p011_5.png] view at source ↗
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Figure 6. Figure 6: FIG. 6 [PITH_FULL_IMAGE:figures/full_fig_p012_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: FIG. 7 [PITH_FULL_IMAGE:figures/full_fig_p014_7.png] view at source ↗
read the original abstract

We present \texttt{HAPS-hFF1.0}, a new global QCD analysis of unidentified charged-hadron fragmentation functions (FFs) using single-inclusive electron-positron annihilation (SIA) data together with the modern COMPASS semi-inclusive deep-inelastic scattering (SIDIS) multiplicities. The COMPASS input consists of the 2025 proton-target measurement and the revised isoscalar-target multiplicities provided in the COMPASS addendum 2026. The extraction is performed at both next-to-leading order (NLO) and next-to-next-to-leading order (NNLO), allowing us to study the perturbative stability of the QCD fit and the impact of the updated SIDIS information on the flavor structure of the FFs. We find that the modern COMPASS multiplicities can be consistently described together with the SIA data and provide important charge-separated constraints on the light-quark and antiquark FFs. The comparison between the NLO and NNLO extractions indicates a stable quark-sector determination, while the gluon FF remains less directly constrained in the present SIA+SIDIS analysis. Our results highlight the importance of the modern COMPASS SIDIS multiplicities for precision studies of unidentified charged-hadron fragmentation and for future global FF determinations. The resulting \texttt{HAPS-hFF1.0} replicas are publicly available in standard LHAPDF format.

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 / 0 minor

Summary. The manuscript presents HAPS-hFF1.0, a new global QCD analysis of unidentified charged-hadron fragmentation functions extracted from SIA data combined with the 2025 COMPASS proton-target SIDIS multiplicities and the 2026 revised isoscalar-target multiplicities. Fits are performed at both NLO and NNLO to examine perturbative stability and the impact of the updated SIDIS input on the flavor structure. The central claim is that the modern COMPASS multiplicities are consistently described together with SIA data, supplying important charge-separated constraints on light-quark and antiquark FFs, while the quark sector remains stable between orders and the gluon FF is less directly constrained; the resulting replicas are released in LHAPDF format.

Significance. If the fit quality and stability claims hold, the work supplies an updated FF set that incorporates recent experimental input and demonstrates the value of modern SIDIS multiplicities for charge separation. The public release of replicas in standard LHAPDF format is a concrete strength that facilitates community use and further global analyses.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for the positive assessment of our manuscript and the recommendation to accept. The report contains no major comments requiring response.

Circularity Check

0 steps flagged

No significant circularity detected

full rationale

This is a standard global QCD fit of fragmentation functions to external SIA and COMPASS SIDIS multiplicity data. The central claim (consistent description and charge-separated constraints) is obtained by minimizing a chi-squared function against independent experimental measurements; no equation or result reduces by construction to a prior self-citation, fitted input renamed as prediction, or self-definitional loop. The NLO/NNLO comparison and public LHAPDF replicas are outputs of the fit, not inputs that presuppose the final flavor structure.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

Abstract-only review; specific parametrization forms, number of free parameters in the FF ansatz, and any ad-hoc cuts are not stated. Standard QCD assumptions (factorization, DGLAP evolution) are implicit but not enumerated.

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Reference graph

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