Fermilab is launching a suite of experiments that hunt for physical anomalies and look for discrepancies from the predictions of the Standard Model, our theoretical framework describing fundamental interactions. Scientists working on the Muon g-2 and Mu2e experiments use beams of muons to do this. The muon is a heavy version of the electron that can be produced in particle interactions. The Muon Department is home for Fermilab scientists, staff, and users from academic institutions around the world, working on muon experiments. The Standard Model is silent on the prospect of lepton conversions, such as neutrino oscillation or muon-to-electron conversions. Theorists have patched the Standard Model to include the shape-shifting behavior of neutrinos, but there is no deep understanding of why or how these transformations happen. Muon-to-electron conversions go beyond the Standard Model entirely to the realm of New Physics models.
The Mu2e experiment will also use an intense beam of muons but will examine a property outside the understanding of the Standard Model: the possibility of a muon-to-electron conversion.