@misc{10481/107541,
year = {2025},
month = {10},
url = {https://hdl.handle.net/10481/107541},
abstract = {The absence of direct evidence for new physics at current collider energies motivates the study of indirect
effects within the framework of the Standard Model effective field theory (SMEFT). In this work, we
investigate the role of the A4 discrete flavor symmetry in constraining the UV dynamics, giving rise to
dimension-six SMEFT operators involving leptons. We consider renormalizable interactions between SM
fields and heavy mediators, classified according to their A4 transformation properties in the modular
framework, where Yukawa structures are encoded in modular forms. Restricting our analysis to UV
interactions with at most a single modular form insertion, we study the resulting classification of A4 UV
mediator irreducible representations and explore their implications across a range of observables, including
both lepton-flavor-conserving and lepton-flavor-violating processes. A detailed phenomenological analysis
is carried out, incorporating both tree-level and one-loop matching contributions for scalar and fermionic
mediators, as well as leading-log renormalization group equation effects in case of vectors.},
organization = {Ministerio de Ciencia, Innovación y Universidades (FPU23/01639)},
organization = {MICIU/AEI - FEDER/UE (PID2022-139466NB-C21)},
organization = {Junta de Andalucía (P21_00199, FQM10)},
organization = {Consejería de Universidad, Investigación e Innovación, Gobierno de España / Unión Europea, NextGeneration ( AST22 6.5)},
organization = {Swiss National Science Foundation (SNF, Eccellenza Professorial Fellowship, Project No. 186866)},
publisher = {American Physical Society},
title = {Leptonic flavor from a modular A4 symmetry: UV mediators and SMEFT realizations},
doi = {10.1103/hdgd-cq45},
author = {Moreno-Sánchez, Adrián and Palavric, Ajdin},
}