Charged Lepton Flavor Violation at the High-Energy Colliders: Neutrino Mass Relevant Particles

Yongchao Zhang

doi:10.3390/universe8030164

Abstract

We summarize the potential charged lepton flavor violation (LFV) from neutrino mass relevant models, for instance the seesaw mechanisms. In particular, we study, in a model-dependent way, the LFV signals at the high-energy hadron and lepton colliders originating from the beyond standard model (BSM) neutral scalar H, doubly charged scalar H±±, heavy neutrino N, heavy WR boson, and the Z′ boson. For the neutral scalar, doubly charged scalar and Z′ boson, the LFV signals originate from the (effective) LFV couplings of these particles to the charged leptons, while for the heavy neutrino N and WR boson, the LFV effects are from flavor mixing in the neutrino sector. We consider current limits on these BSM particles and estimate their prospects at future high-energy hadron and lepton colliders.

Highlights

We summarize the lepton flavor violation (LFV) effects from a couple of representative particles in the seesaw mechanisms, i.e., the beyond standard model (BSM) neutral scalar H, doubly charged scalar H ±±, heavy neutrino N, heavy WR boson, and the Z 0 boson
We summarized briefly the LFV signals from some representative particles in the seesaw frameworks, i.e., the BSM neutral scalar H, doubly charged scalar
The LFV signals induced by these particles can originate from the direct LFV couplings in the charged lepton sector, i.e., the neutral scalar H, the doubly charged scalar, and the Z 0 boson

Summary

Introduction

Depending on model details and specific UV completions, the BSM particles from the seesaw frameworks can be of spin zero, half, or one, i.e., the CP-even scalars or pseudoscalars, fermions, and vector bosons. We summarize the LFV effects from a couple of representative particles in the seesaw mechanisms, i.e., the BSM neutral scalar H, doubly charged scalar H ±± , heavy neutrino N, heavy WR boson, and the Z 0 boson. It is worked as much in a model independent way as possible, and we do not consider too much dependence on the model details.

BSM Neutral Scalar H

Heavy Neutrino N

Heavy WR Boson

Z 0 Boson

Conclusions