Kaon distribution functions from empirical information

Using available information from Drell-Yan data on pion and kaon structure functions, an approach is described which enables the development of pointwise profiles for all pion and kaon parton distribution functions (DFs) without reference to theories of hadron structure. The key steps are construction of structure-function-constrained probability-weighted ensembles of valence DF replicas and use of an evolution scheme for parton DFs that is all-orders exact. The DFs obtained express qualitatively sound features of light-meson structure, e.g ., the effects of Higgs boson couplings into QCD and the size of heavy-quark momentum fractions in light hadrons. In order to improve the results, additional and more precise data on the u -quark-in-kaon, u K , to u -quark-in-pion, u π , DF ratio would be necessary. Of greater value would be extraction of u K alone, thereby avoiding inference from the ratio: currently, the data-based form of u K is materially influenced by results for u π .

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Publication Details

Journal
Physics Letters B
Published
2025-04-06
DOI
https://doi.org/10.1016/j.physletb.2025.139451
Citations
6
Primary Topic
Quantum Chromodynamics and Particle Interactions
Type
article
Field-Weighted Citation Impact
11.22

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article

Kaon distribution functions from empirical information

Craig D. Roberts, Zhen-Ni Xu, J. Rodrı́guez-Quintero, Khépani Raya et al.
6 citations
Physics Letters B
Quantum Chromodynamics and Particle Interactions
11.22
article

Kaon distribution functions from empirical information

Craig D. Roberts, Zhen-Ni Xu, J. Rodrı́guez-Quintero, Khépani Raya, Daniele Binosi, Chen Chen
article en
6 citations

Abstract

Using available information from Drell-Yan data on pion and kaon structure functions, an approach is described which enables the development of pointwise profiles for all pion and kaon parton distribution functions (DFs) without reference to theories of hadron structure. The key steps are construction of structure-function-constrained probability-weighted ensembles of valence DF replicas and use of an evolution scheme for parton DFs that is all-orders exact. The DFs obtained express qualitatively sound features of light-meson structure, e.g ., the effects of Higgs boson couplings into QCD and the size of heavy-quark momentum fractions in light hadrons. In order to improve the results, additional and more precise data on the u -quark-in-kaon, u K , to u -quark-in-pion, u π , DF ratio would be necessary. Of greater value would be extraction of u K alone, thereby avoiding inference from the ratio: currently, the data-based form of u K is materially influenced by results for u π .

Physics Letters BVol. 865
University of Science and Technology of China (CN), Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR), European Centre for Theoretical Studies in Nuclear Physics and Related Areas (IT), Peng Huanwu Center for Fundamental Theory (CN), CEA Paris-Saclay (FR), Institut de Recherche sur les Lois Fondamentales de l'Univers (FR), Universidad de Huelva (ES), Nanjing University (CN)
Ministerio de Ciencia, Innovación y Universidades, National Natural Science Foundation of China, Ministerio de Ciencia e Innovación, Junta de Andalucía
Openalex Percentile: Top 2%
Quantum Chromodynamics and Particle Interactions
11.22
DOIOpen Access PDFOpenAlex
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