TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhysProc.16.011
TI  - Flavor violating $\ell_i$ decay into $\ell_j$ and a light gauge boson
PY  - 2025/07/14
UR  - https://scipost.org/SciPostPhysProc.16.011
JF  - SciPost Physics Proceedings
JA  - SciPost Phys. Proc.
VL  - 
IS  - 16
SP  - 011
A1  - Ibarra, Alejandro
AU  - Marín, Marcela
AU  - Roig, Pablo
AB  - The $\ell_i\to\ell_j\chi$ decays, with $\chi$ a boson associated to the $U(1)_\chi$ symmetry, have not been described satisfactorily so far for light spin-one $\chi$. In particular, observables exhibited an unphysical divergence in the limit of massless $\chi$, associated to its longitudinal polarizations. Based on gauge symmetry, we show how to correct this issue. To this end, we consider two general models realizing the effective field theory description. Being the LFV generated either at tree level or at one loop, these processes are well behaved for light $m_\chi$. We discuss the most salient phenomenological consequences and its relevance in the searches for this kind of decays.
ER  -

@Article{10.21468/SciPostPhysProc.16.011,
	title={{Flavor violating $\ell_i$ decay into $\ell_j$ and a light gauge boson}},
	author={Alejandro Ibarra and Marcela Marín and Pablo Roig},
	journal={SciPost Phys. Proc.},
	pages={011},
	year={2025},
	publisher={SciPost},
	doi={10.21468/SciPostPhysProc.16.011},
	url={https://scipost.org/10.21468/SciPostPhysProc.16.011},
}