The impossible collider.

The article focuses on the development and potential of the muon collider as a next-generation particle accelerator capable of addressing unresolved questions in particle physics. Unlike the Large Hadron Collider (LHC), which collides protons, a muon collider would smash together muons—heavier cousins of electrons—offering cleaner collisions at higher energies within a relatively compact ring. Despite challenges such as the muons’ extremely short lifetime and the difficulty of producing focused beams, recent technological advances, including ionisation cooling, have made the concept increasingly feasible. The muon collider aims to probe the Higgs boson more deeply than existing machines, potentially revealing new physics related to the stability of the universe and the fundamental nature of mass. International collaborations are currently conducting feasibility studies and planning demonstrator facilities, with hopes of producing detailed designs by 2030 and possibly operating a prototype in the early 2030s. [Extracted from the article]