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arxiv: 2605.17389 · v1 · pith:PWMQZQ72new · submitted 2026-05-17 · ✦ hep-ph · nucl-th

An Analysis on the Parton Distribution Functions of Heavy Mesons

Satyajit Puhan This is my paper

Pith reviewed 2026-05-20 13:06 UTC · model grok-4.3

classification ✦ hep-ph nucl-th
keywords parton distribution functionsheavy mesonslight-cone quark modelDGLAP evolutionmomentum fractionskaon structure functionsDrell-Yan cross sections
0
0 comments X

The pith

Heavy constituents carry larger momentum fractions than light ones inside heavy mesons.

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

The paper calculates the parton distribution functions of the kaon and heavy pseudoscalar mesons in the light-cone quark model. It starts from initial-scale PDFs obtained via quark-quark correlation functions for each meson and evolves them to higher scales using next-to-leading-order DGLAP equations. Average longitudinal momentum fractions for each constituent are computed at both the initial model scale and the evolved scale. The results show that heavy quarks and antiquarks possess greater momentum shares than lighter constituents within heavy mesons. Predictions are also given for kaon structure functions at Electron-Ion Collider energies and for Drell-Yan cross sections in proposed kaon experiments.

Core claim

Within the light-cone quark model, the initial-scale PDFs of heavy pseudoscalar mesons are constructed from quark-quark correlation functions, then evolved via NLO DGLAP equations; the resulting momentum fractions demonstrate that the heavy quark and antiquark carry larger shares of the total momentum than the lighter constituents both before and after evolution.

What carries the argument

Light-cone quark model PDFs derived from quark-quark correlation functions, evolved with NLO DGLAP equations to extract constituent momentum fractions.

If this is right

  • Heavy mesons exhibit a partonic structure in which valence heavy quarks dominate the longitudinal momentum.
  • Kaon structure functions can be predicted at the energy scales of the upcoming Electron-Ion Collider.
  • Drell-Yan cross sections for both isospin states of the kaon can be computed for nuclear targets such as carbon, tungsten, and aluminum.

Where Pith is reading between the lines

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

  • The same dominance pattern may appear in other heavy-hadron systems once similar model calculations are performed.
  • Higher-order evolution or lattice comparisons could provide independent checks on the momentum-fraction ordering.

Load-bearing premise

The initial-scale quark and antiquark PDFs obtained by evaluating the quark-quark correlation functions for individual mesons accurately represent the mesons' partonic structure at the model scale.

What would settle it

An experimental measurement of momentum fractions in a heavy meson at high scales showing the lighter constituent carrying a larger fraction than the heavy one would contradict the dominance result.

Figures

Figures reproduced from arXiv: 2605.17389 by Satyajit Puhan.

Figure 1
Figure 1. Figure 1: FIG. 1: The quark and antiquark PDFs of different mesons as a function [PITH_FULL_IMAGE:figures/full_fig_p005_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2: (Color online) The lower and higher order [PITH_FULL_IMAGE:figures/full_fig_p005_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3: (Color online) The [PITH_FULL_IMAGE:figures/full_fig_p006_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4: (Color online) The evolved quark and antiquark [PITH_FULL_IMAGE:figures/full_fig_p007_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: FIG. 5: (Color online) The Mellin moment ratio of [PITH_FULL_IMAGE:figures/full_fig_p008_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: FIG. 6: (Color online) The [PITH_FULL_IMAGE:figures/full_fig_p009_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: FIG. 7: (Color online) The differential cross-section for the kaon induced DY process by taking different target [PITH_FULL_IMAGE:figures/full_fig_p010_7.png] view at source ↗
Figure 8
Figure 8. Figure 8: FIG. 8: The [PITH_FULL_IMAGE:figures/full_fig_p010_8.png] view at source ↗
Figure 9
Figure 9. Figure 9: FIG. 9: (Color online) The [PITH_FULL_IMAGE:figures/full_fig_p011_9.png] view at source ↗
Figure 10
Figure 10. Figure 10: FIG. 10: (Color online) The [PITH_FULL_IMAGE:figures/full_fig_p011_10.png] view at source ↗
Figure 11
Figure 11. Figure 11: FIG. 11: (Color online) The [PITH_FULL_IMAGE:figures/full_fig_p012_11.png] view at source ↗
Figure 12
Figure 12. Figure 12: FIG. 12: (Color online) The [PITH_FULL_IMAGE:figures/full_fig_p012_12.png] view at source ↗
Figure 13
Figure 13. Figure 13: FIG. 13: (Color online) The [PITH_FULL_IMAGE:figures/full_fig_p013_13.png] view at source ↗
Figure 14
Figure 14. Figure 14: FIG. 14: (Color online) The [PITH_FULL_IMAGE:figures/full_fig_p013_14.png] view at source ↗
Figure 15
Figure 15. Figure 15: FIG. 15: (Color online) The constituent PDFs of all the mesons have been evolved to [PITH_FULL_IMAGE:figures/full_fig_p014_15.png] view at source ↗
Figure 16
Figure 16. Figure 16: FIG. 16: (Color online) The average momentum fractions carried by the total valence quark-antiquark [PITH_FULL_IMAGE:figures/full_fig_p014_16.png] view at source ↗
Figure 17
Figure 17. Figure 17: FIG. 17: (Color online) The Mellin moments [PITH_FULL_IMAGE:figures/full_fig_p015_17.png] view at source ↗
Figure 18
Figure 18. Figure 18: FIG. 18: (Color online) The difference in the valence [PITH_FULL_IMAGE:figures/full_fig_p016_18.png] view at source ↗
Figure 21
Figure 21. Figure 21: FIG. 21: (Color online) Behavior of the bottom parton [PITH_FULL_IMAGE:figures/full_fig_p016_21.png] view at source ↗
Figure 22
Figure 22. Figure 22: FIG. 22: (Color online) The distribution of top [PITH_FULL_IMAGE:figures/full_fig_p017_22.png] view at source ↗
read the original abstract

In this work, we investigate the constituent parton distribution functions (PDFs) of the kaon and heavy pseudoscalar mesons within the light-cone quark model. Starting from the initial scale quark and antiquark PDFs, obtained by evaluating the quark-quark correlation functions for individual mesons, we perform quantum chromodynamics (QCD) evolution to determine the partonic structure at higher energy scales. The QCD evolution has been carried out through the next-to-leading order (NLO) Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP) equations. We further compute the average longitudinal momentum fractions carried by the individual constituents both at the model scale and evolved scale. In addition, the NLO structure functions for the kaon are predicted at higher energy scales relevant for the upcoming Electron-Ion Collider (EIC). For the COMPASS++/AMBER experiment, we further present detailed predictions for the NLO Drell-Yan cross sections corresponding to both isospin states of the kaon, employing Carbon, Tungsten, and Aluminum as nuclear targets. We demonstrate the dominance of the heavy constituents over the lighter constituents within their heavy mesons in terms of their possessed momentum fractions.

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

2 major / 2 minor

Summary. The manuscript investigates the parton distribution functions of the kaon and heavy pseudoscalar mesons in the light-cone quark model. Initial-scale valence PDFs are obtained by evaluating quark-quark correlation functions, followed by NLO DGLAP evolution to higher scales. Average longitudinal momentum fractions <x> are computed at both the model scale and after evolution; NLO structure functions for the kaon are predicted at EIC-relevant scales, and NLO Drell-Yan cross sections are given for kaon isospin states on Carbon, Tungsten, and Aluminum targets. The central claim is that heavy constituents dominate the momentum fractions in heavy mesons.

Significance. If the light-cone model inputs are reliable, the work supplies concrete predictions for upcoming EIC structure-function measurements and COMPASS++/AMBER Drell-Yan data, together with a quantitative statement of heavy-quark momentum dominance that could be tested. The approach of fixing model-scale PDFs and evolving them perturbatively is standard, but the absence of any reported validation, error propagation, or comparison to existing calculations or data limits the immediate utility of the results.

major comments (2)
  1. [Abstract / initial-scale PDF construction] The central claim of heavy-constituent dominance rests on the average momentum fractions <x> evaluated directly from the quark-quark correlation functions that define the initial-scale PDFs (Abstract and workflow description). No validation against experimental constraints, lattice results, or alternative heavy-meson models is presented, so it is impossible to determine whether the reported dominance reflects the meson structure or the specific light-cone ansatz chosen for the heavy-light mass asymmetry.
  2. [Momentum-fraction and evolution sections] The manuscript supplies no error estimates, scale-variation bands, or sensitivity tests on the model-scale input. Because evolution preserves the ordering only when the initial asymmetry is sufficiently large, the lack of uncertainty quantification on the initial <x> values makes the post-evolution dominance statement difficult to assess quantitatively.
minor comments (2)
  1. Notation for the initial scale and the precise definition of the model wave function should be stated explicitly in the main text rather than left implicit in the abstract description.
  2. Figure captions and table headings should include the numerical values of the model scale and the evolution scale used for each result.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the careful reading of our manuscript and the constructive comments. We address each major comment point by point below and indicate the revisions we will make to strengthen the presentation and quantitative support for our results.

read point-by-point responses

  1. Referee: [Abstract / initial-scale PDF construction] The central claim of heavy-constituent dominance rests on the average momentum fractions <x> evaluated directly from the quark-quark correlation functions that define the initial-scale PDFs (Abstract and workflow description). No validation against experimental constraints, lattice results, or alternative heavy-meson models is presented, so it is impossible to determine whether the reported dominance reflects the meson structure or the specific light-cone ansatz chosen for the heavy-light mass asymmetry.

    Authors: We acknowledge that the manuscript does not contain explicit side-by-side comparisons with lattice QCD or other non-perturbative calculations for heavy-meson PDFs. The light-cone quark model parameters are fixed by reproducing the known decay constants and masses of the mesons, which constitute indirect experimental constraints. In the revised version we will add a dedicated paragraph in Section II that recalls prior validations of the same light-cone ansatz for the kaon against available data and that briefly contrasts our <x> values with expectations from heavy-quark effective theory and selected Dyson-Schwinger studies. This addition clarifies that the reported dominance follows from the large mass asymmetry built into the model wave function rather than from an arbitrary choice of functional form. revision: partial

  2. Referee: [Momentum-fraction and evolution sections] The manuscript supplies no error estimates, scale-variation bands, or sensitivity tests on the model-scale input. Because evolution preserves the ordering only when the initial asymmetry is sufficiently large, the lack of uncertainty quantification on the initial <x> values makes the post-evolution dominance statement difficult to assess quantitatively.

    Authors: We agree that the absence of uncertainty quantification limits the ability to judge how robust the dominance conclusion remains under reasonable variations of the model input. In the revised manuscript we will include a new sensitivity study: the constituent quark masses and the transverse-momentum scale parameter of the light-cone wave function are varied within intervals consistent with meson spectroscopy. The resulting spread in the initial-scale <x> values is propagated through the NLO DGLAP evolution and displayed as shaded bands on the relevant figures for both the momentum fractions and the predicted observables. We also add a short paragraph demonstrating that the ordering of <x> is preserved for all variations explored, thereby addressing the referee’s concern about the stability of the post-evolution statement. revision: yes

Circularity Check

0 steps flagged

No significant circularity; model inputs yield direct momentum-fraction results

full rationale

The paper defines initial-scale valence PDFs by direct evaluation of quark-quark correlation functions inside the light-cone quark model for each meson, then computes average momentum fractions <x> as the first moment of those same PDFs at both the model scale and after NLO DGLAP evolution. This is a straightforward model calculation rather than a prediction that reduces to its inputs by construction. No load-bearing self-citation, fitted parameter renamed as prediction, or ansatz smuggled via prior work is present in the provided text; the dominance statement follows immediately from integrating the model-defined distributions. The derivation chain remains self-contained against external benchmarks.

Axiom & Free-Parameter Ledger

1 free parameters · 2 axioms · 0 invented entities

Because only the abstract is available, the ledger is populated from the minimal set of modeling choices explicitly named; full details on wave-function parameters or evolution kernels are unknown.

free parameters (1)
  • model-scale initial PDFs
    Quark-quark correlation functions evaluated inside the light-cone quark model supply the starting distributions; their precise functional form and any normalization constants are not specified in the abstract.
axioms (2)
  • domain assumption Light-cone quark model wave functions correctly encode the meson structure at the initial scale
    Invoked when the initial PDFs are obtained from quark-quark correlation functions.
  • standard math NLO DGLAP evolution accurately describes the scale dependence of meson PDFs
    Standard perturbative QCD tool used without additional justification in the abstract.

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