A new Parameterization for the Pion Vector Form Factor

C. Hanhart

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classification ✦ hep-ph nucl-th

keywords formpionenergiesfactorhighparameterizationvectoraccuracy

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A new approach to the parameterization of pion form factors is presented and for illustration applied to the pion vector form factor. It has the correct analytic structure, is at low energies consistent with recent high accuracy analyses of $\pi\pi$ scattering phase shifts and, at high energies, maps smoothly onto the well--known, successful isobar model.

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Dispersive analysis of the $J/\psi\to\pi^0 \gamma^\ast$ transition form factor with $\rho$-$\omega$ mixing effects
hep-ph 2025-11 unverdicted novelty 7.0

Dispersive analysis with ρ-ω mixing produces a two-parameter fit describing BESIII data on the J/ψ→π⁰γ* form factor from 0 to 2.8 GeV and extracts a (62 ± 21)° relative phase between strong and electromagnetic modes.