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γ(*)+N(940)12+→N(1520)32− helicity amplitudes and transition form factors

L. Albino1,2,*, G. Paredes-Torres3,4,5,†, K. Raya2,‡, A. Bashir2,3,§, and J. Segovia1,∥

  • *Contact author: luis.albino.fernandez@gmail.com
  • †Contact author: gustavo.paredes@umich.mx
  • ‡Contact author: khepani.raya@dci.uhu.es
  • §Contact author: adnan.bashir@umich.mx
  • ∥Contact author: jsegovia@upo.es
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Phys. Rev. D 112, 074015 – Published 14 October, 2025

DOI: https://doi.org/10.1103/qpr2-nwtw

Abstract

We recently reported new results on the γ(*)+N(940)12+→Δ(1700)32− transition form factors using a symmetry-preserving treatment of a vector ⊗vector contact interaction (SCI) within a coupled formalism based on the Dyson-Schwinger, Bethe-Salpeter, and Faddeev equations. In this work, we extend our investigation to the γ(*)+N(940)12+→N(1520)32− transition. Our computed transition form factors show reasonable agreement with experimental data at large photon virtualities. However, deviations emerge at low Q2, where experimental results exhibit a sharper variation than theoretical predictions. This discrepancy is expected, as these continuum QCD analyses account only for the quark-core of baryons, while low photon virtualities are dominated by meson cloud effects. We anticipate that these analytical predictions, based on the simplified SCI framework, will serve as a valuable benchmark for more refined studies and QCD-based truncations that incorporate quark angular momentum and the contributions of scalar and vector diquarks.

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Phys. Rev. D 112, 074015– Published 14 October, 2025
  • Received 27 May 2025
  • Accepted 19 September 2025
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