High-energy colliders as a probe of neutrino properties

TL;DR

This paper explores how high-energy colliders can be used to investigate neutrino properties through the decays of Higgs triplet scalars, potentially revealing neutrino mass details and lepton flavor violation.

Contribution

It demonstrates the potential of future high-energy colliders to probe neutrino mass and flavor properties via scalar decays, offering an alternative to low-energy experiments.

Findings

Decays of Higgs triplet scalars can inform neutrino mass scale and hierarchy.

High-energy collider signatures may detect lepton flavor violation.

Four-lepton signals could be key discovery channels for neutrino-related phenomena.

Abstract

The mediators of neutrino mass generation can provide a probe of neutrino properties at the next round of high-energy hadron (FCC-hh) and lepton colliders (FCC-ee/ILC/CEPC/CLIC). We show how the decays of the Higgs triplet scalars mediating the simplest seesaw mechanism can shed light on the neutrino mass scale and mass-ordering, as well as the atmospheric octant. Four-lepton signatures at the high-energy frontier may provide the discovery-site for charged lepton flavour non-conservation in nature, rather than low-energy intensity frontier experiments.