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arXiv · 2602.10775

Unified Description of Pseudoscalar Meson Structure from Light to Heavy Quarks

B. Almeida-Zamora·L. Albino·A. Bashir·J. J. Cobos-Martínez·J. Segovia
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Abstract

We present a comprehensive review of the structure of pseudoscalar mesons within an algebraic model formulated in the light-front framework. The approach provides a unified description of leading-twist parton distribution amplitudes (PDAs), light-front wave functions (LFWFs), generalized parton distributions (GPDs), parton distribution functions (PDFs), elastic electromagnetic form factors (EFFs), charge radii, and impact-parameter GPDs (IPS-GPDs), all derived consistently from the same underlying Bethe-Salpeter amplitudes. Results are discussed for light ($\pi$, $K$), heavy-light ($D$, $D_s$, $B$, $B_s$, $B_c$), and heavy-heavy ($\eta_c$, $\eta_b$) pseudoscalar mesons, allowing for a systematic analysis of the role played by quark-mass asymmetry and heavy-quark dynamics. The study highlights how increasing quark masses drive a transition from broad, asymmetric momentum distributions to increasingly symmetric and spatially compact configurations. Comparisons with lattice QCD, Dyson-Schwinger equation studies, and contact-interaction models are presented where available. Overall, the algebraic model offers a transparent and symmetry-consistent framework to explore the three-dimensional momentum and spatial structure of pseudoscalar mesons across all quark-mass regimes.

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B. Almeida-Zamora, L. Albino, A. Bashir, J. J. Cobos-Martínez, J. Segovia. 2026-02-11. Unified Description of Pseudoscalar Meson Structure from Light to Heavy Quarks. https://arxiv.org/abs/2602.10775

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