Status of the Mu3e experiment

The upcoming Mu3e experiment searches for the lepton flavour violating decay μ+→e+e−e+ aiming for a final single event sensitivity of 1 x 10-16. We are currently finalizing the design of the first phase, which will have single event sensitivity of 2 x 10-15, which will exploit the current muon rates available at the Paul Scherrer Institute. The Mu3e detector consist of 4 layers of ultra-thin silicon pixels developed for this experiment, combined with scintillating fibers and tile timing detectors to deal with the high decay rates. Current prototypes meet all requirements, and the project is moving from the R&D phase to construction.