Structure-Dependent Electromagnetic Finite-Size Effects
Abstract
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 ) as well as in the leptonic decay amplitudes of pions and kaons (at order ). Knowledge of the latter is essential for Standard Model precision tests in the flavour physics sector from lattice simulations.
Cite
@article{arxiv.2110.15765,
title = {Structure-Dependent Electromagnetic Finite-Size Effects},
author = {Matteo Di Carlo and Maxwell T. Hansen and Nils Hermansson-Truedsson and Antonin Portelli},
journal= {arXiv preprint arXiv:2110.15765},
year = {2021}
}
Comments
Proceedings for talks presented at "The 38th International Symposium on Lattice Field Theory, LATTICE2021, July 26-30 2021", "A Virtual Tribute to Quark Confinement and the Hadron Spectrum 2021, August 2-6 2021" and "Particles and Nuclei International Conference 2021, PANIC2021, September 5-10 2021"