Transverse Structure of the Kaon: A light-front Hamiltonian Approach
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arXiv
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| Autores principales: | , , , , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| _version_ | 1866918384211329024 |
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| author | Lu, Yuanqi Zhu, Zhimin Lan, Jiangshan Mondal, Chandan Zhao, Xingbo Vary, James P. |
| author_facet | Lu, Yuanqi Zhu, Zhimin Lan, Jiangshan Mondal, Chandan Zhao, Xingbo Vary, James P. |
| contents | We employ the Basis Light-Front Quantization (BLFQ) framework to compute the leading-twist (twist-2) and subleading-twist (twist-3) transverse-momentum-dependent parton distribution functions (TMDs) of the kaon. The light-front wave functions are obtained by diagonalizing a light-front QCD Hamiltonian that includes quark-antiquark (|q\bar{q}\rangle) and quark-antiquark-gluon (|q\bar{q}g\rangle) Fock components together with a three-dimensional confinement. Using the QCD equations of motion, the twist-3 TMDs are decomposed into twist-2 constributions and genuine twist-3 terms, the latter encoding quark-quark-gluon correlations beyond the probabilistic picture. These genuine twist-3 constributions arise from the interference between the |q\bar{q}\rangle and |q\bar{q}g\rangle sectors, which are usually negelected in the Wandzura-Wilczek approximation. This work provides the first theoretical predictions of kaon subleading-twist TMDs that explicitly account for Fock-sector interference. In addition, we present results for the kaon's twist-2 and twist-3 collinear parton distribution functions (PDFs). The twist-2 PDFs are found to be in good agreement with the recent global analysis by the JAM collaboration. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_11599 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Transverse Structure of the Kaon: A light-front Hamiltonian Approach Lu, Yuanqi Zhu, Zhimin Lan, Jiangshan Mondal, Chandan Zhao, Xingbo Vary, James P. High Energy Physics - Phenomenology High Energy Physics - Theory Nuclear Theory We employ the Basis Light-Front Quantization (BLFQ) framework to compute the leading-twist (twist-2) and subleading-twist (twist-3) transverse-momentum-dependent parton distribution functions (TMDs) of the kaon. The light-front wave functions are obtained by diagonalizing a light-front QCD Hamiltonian that includes quark-antiquark (|q\bar{q}\rangle) and quark-antiquark-gluon (|q\bar{q}g\rangle) Fock components together with a three-dimensional confinement. Using the QCD equations of motion, the twist-3 TMDs are decomposed into twist-2 constributions and genuine twist-3 terms, the latter encoding quark-quark-gluon correlations beyond the probabilistic picture. These genuine twist-3 constributions arise from the interference between the |q\bar{q}\rangle and |q\bar{q}g\rangle sectors, which are usually negelected in the Wandzura-Wilczek approximation. This work provides the first theoretical predictions of kaon subleading-twist TMDs that explicitly account for Fock-sector interference. In addition, we present results for the kaon's twist-2 and twist-3 collinear parton distribution functions (PDFs). The twist-2 PDFs are found to be in good agreement with the recent global analysis by the JAM collaboration. |
| title | Transverse Structure of the Kaon: A light-front Hamiltonian Approach |
| topic | High Energy Physics - Phenomenology High Energy Physics - Theory Nuclear Theory |
| url | https://arxiv.org/abs/2603.11599 |