Muon Colliders

Input to the European Particle Physics Strategy Update

a dedicated muon collider is the only lepton-antilepton collider option able to scan the Higgs resonance and to precisely measure its mass and width.

A figure of merit for energy-frontier facilities may be defined as the luminosity per unit power. This figure of merit appears to be substantially larger for the muon collider than for any other lepton collider technology in the multi-TeV range.

Main challenges:

1. short muon lifetime
2. difficulty of producing large numbers of muons in bunches with small emittance.
3. beam background from the decay of muons

Neutrino factory