Muon colliders

AbstractA muon storage ring operating as a Higgs factory holds the promise, unique to a muon collider, of precision physics at the Higgs pole. A precision physics program requires a high luminosity machine, and the task of obtaining the necessary phase space compression and acceleration within the short muon lifetime presents a challenge to the state of the art in accelerator technology. Recent innovations, including ring coolers and gas filled cavities, might just point the way to a feasible design. Here we discuss the newest developments within the context of the physics goals of such a machine.