Study of Gauged Lepton Symmetry Signatures at Colliders

TL;DR

This paper introduces a new anomaly-free gauged lepton number model, analyzing its collider signatures and constraints, including interference effects and electroweak precision bounds, with implications for future collider experiments.

Contribution

It constructs a minimal anomaly-free gauged lepton number model with radiative neutrino masses and studies its collider phenomenology and experimental constraints.

Findings

Interference effects among $Z_ ext{ell}$, photon, and $Z$ can be observed at future $e^+e^-$ colliders.

Electroweak precision data constrains the mass splitting of new lepton doublets.

Collider signals of the $Z_ ext{ell}$ gauge boson are accessible below its mass at future experiments.

Abstract

We construct a new gauged $U(1)_\ell$ lepton number model which is anomaly-free for each SM generation. The active neutrino masses are radiatively generated with a minimal scalar sector. The phenomenology and collider signals are studied. The interference effects among the new gauge boson, $Z_\ell$, photon, and $Z$-boson can be probed at the future $e^+e^-$ colliders even if the center-of-mass energy is below the mass of $Z_\ell$. Moreover, the electroweak precision sets a stringent bound on the mass splitting of the new lepton doublets.