PoS - Proceedings of Science
Volume 380 - Particles and Nuclei International Conference 2021 (PANIC2021) - Flavour physics - CKM and beyond
Structure-dependent electromagnetic finite-size effects
M. Di Carlo, M. Hansen, N. Hermansson-Truedsson* and A. Portelli
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Pre-published on: March 16, 2022
Published on: May 24, 2022
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 finite-size structure-dependence in the pseudoscalar mass (at order $1/L^3$) as well as in the leptonic decay amplitudes of pions and kaons (at order $1/L^2$). Knowledge of the latter is essential for Standard Model precision tests in the flavour physics sector from lattice simulations.
DOI: https://doi.org/10.22323/1.380.0146
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