RT Journal Article
T1 Empirical determination of the kaon distribution amplitude
A1 Chang, Lei
A1 Liu, Yu-Bin
A1 Raya, Khépani
A1 Sultan, M. Atif
AB We propose a data-driven approach to extract the kaon leading-twist distribution amplitude (DA) from empirical information on the ratio of the neutral-to-charged kaon electromagnetic form factors, R K . Our study employs a two-parameter representation of the DA at ζ = 2 GeV , designed to capture the expected broadening and asymmetry of the distribution, as well as the soft endpoint behavior predicted by quantum chromodynamics (QCD). Our leading-order analysis of the latest experimental measurements of R K reveals that the extracted DA exhibits a somewhat significant skewness, with the first symmetric moment being approximately ⟨ 1 − 2 x ⟩ K = 0.082 ( 7 ) . On the other hand, the broadness and general shape of the produced distributions show a reasonable consistency with contemporary lattice and continuum QCD analyses. These findings highlight the importance of accurately determining the profile of the DA, especially the skewness and its relation to S U F ( 3 ) flavor symmetry breaking, as well as the inclusion of higher-order effects in the hard-scattering kernels for analyzing data at experimentally accessible scales.
PB American Physical Society
SN 2470-0010
SN 2470-0029 (electrónico)
YR 2025
FD 2025
LK https://hdl.handle.net/10272/27992
UL https://hdl.handle.net/10272/27992
LA eng
NO Chang, L., Liu, Y.-B., Raya, K., & Sultan, M. A. (2025). Empirical determination of the kaon distribution amplitude. Physical Review D, 112(11). https://doi.org/10.1103/3hd9-7wnt
NO This work is supported by the National Natural Science Foundation of China (Grants No. 12135007 and No. 11875169); the Spanish Ministry of Science and Innovation (MICINN, Grant No. PID2022-140440NBC22); and Junta de Andalucía (Grant No. P18-FR-5057).
DS Repositorio Institucional de la Universidad de Huelva
RD 14 jul 2026