Electromagnetic finite-size effects beyond the point-like approximation

@article{Carlo2021ElectromagneticFE,
  title={Electromagnetic finite-size effects beyond the point-like approximation},
  author={Matteo Di Carlo and Maxwell T. Hansen and Nils Hermansson-Truedsson and Antonin Portelli},
  journal={EPJ Web of Conferences},
  year={2021}
}
We present a model-independent and relativistic approach to analytically derive electromagnetic finite-size effects beyond the point-like approximation. The key element is the use of electromagnetic Ward identities to constrain vertex functions, and structure-dependence appears via physical form-factors and their derivatives. We apply our general method to study the leading finitesize structure-dependence in the pseudoscalar mass (at order 1/L3) as well as in the leptonic decay amplitudes of… 
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