Cool Muon Colliders

As Particle Physics continues to push the energy frontier, Muon Colliders
will rise to meet these requirements. A Muon Collider not only has the
potential to evaluate the properties of the Higgs particle by producing
them in factory mode, but can be an extremely useful tool in doing
precision physics and test the Standard Model to unprecedented levels. A
Muon Collider will also open up new energy regimes as the technology is
easily scalable and the machines compact. Before this program can proceed,
the problem of beam cooling has to be rethought.  Standard techniques for
beam cooling are not suitable for muon beams as they take too long. The
muon's properties as a heavy lepton make it a desirable beam candidate but
it comes at a price. The muon has a lifetime of 2.2 us in its rest frame.
This is the time budget needed to produce, cool, accelerate and collide
the muon beams.