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Unified study of scalar, vector, and tensor two-meson form factors in U(3) resonance chiral theory

Jin Hao1, Chun-Gui Duan1,*, Zhi-Hui Guo1,†, J. A. Oller2,‡, and J. Ruiz de Elvira3,§

  • *Contact author: duancg@hebtu.edu.cn
  • †Contact author: zhguo@hebtu.edu.cn
  • ‡Contact author: oller@um.es
  • §Contact author: jacobore@ucm.es
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Phys. Rev. D 114, 074042 – Published 19 October, 2026

DOI: https://doi.org/10.1103/4l13-59h2

Abstract

We perform a systematic study of two-meson form factors of the scalar, vector, and antisymmetric tensor types within the framework of the U(3) resonance chiral theory. The complete perturbative form factors in both the strangeness-conserving and strangeness-changing channels are calculated by incorporating one-loop light-flavor pseudoscalar meson contributions and tree-level resonance exchanges. With these newly calculated chiral results, we construct the corresponding unitarized form factors by incorporating meson-meson final-state interactions. The parameter values obtained in previous meson-meson scattering studies are then exploited to predict the corresponding form factors. Different types of form factors are found to exhibit rather distinct resonance structures across channels.

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Phys. Rev. D 114, 074042– Published 19 October, 2026
  • Received 19 May 2026
  • Accepted 22 September 2026
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