What is the name of the experiment at the Fermi National Accelerator Laboratory in Illinois that hopes to complete construction of its detector in April 2026 to test if a muon can transform into an electron?

The experiment at the Fermi National Accelerator Laboratory in Illinois that is designed to test if a muon can transform into an electron is called Mu2e. This name is shorthand for "Muon-to-Electron Conversion Experiment," clearly stating its primary objective. The Mu2e collaboration is actively working towards its operational phase, with key detector components undergoing commissioning. For instance, a crucial subsystem known as the Cosmic Ray Veto (CRV) detector was successfully commissioned in April 2026, marking a significant step in the detector's overall readiness. While individual components are being finalized and tested, the complete installation of the detector systems is anticipated by late 2026.

The fundamental goal of Mu2e is to observe a never-before-seen phenomenon: a muon transforming directly into an electron without emitting any neutrinos. This process, known as neutrinoless muon-to-electron conversion, is considered extremely rare and is not predicted by the Standard Model of particle physics, which describes the fundamental particles and forces of the universe. Muons are essentially heavier relatives of electrons, about 200 times more massive, and their direct, neutrino-less conversion to electrons would be a profound discovery.

Detecting such an event would provide undeniable evidence of new physics beyond the Standard Model, potentially revealing new particles or forces that scientists have yet to discover. The Mu2e experiment aims to be extraordinarily sensitive, about 10,000 times more so than previous experiments that searched for this elusive transformation. If successful, Mu2e could offer valuable insights into some of the universe's biggest mysteries, such as why different types of particles exist and how the fundamental forces of nature are related. The experiment is expected to commence its physics run in 2027.