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Flavor violating $\ell_i$ decay into $\ell_j$ and a light gauge boson

by Alejandro Ibarra, Marcela Mar\'in and Pablo Roig

Submission summary

Authors (as registered SciPost users): Marcela Marín · Pablo Roig
Submission information
Preprint Link: scipost_202112_00005v1  (pdf)
Date submitted: 2021-12-03 21:32
Submitted by: Marín, Marcela
Submitted to: SciPost Physics Proceedings
Proceedings issue: 16th International Workshop on Tau Lepton Physics (TAU2021)
Ontological classification
Academic field: Physics
Specialties:
  • High-Energy Physics - Phenomenology
Approach: Phenomenological

Abstract

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.

Current status:
In refereeing

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