Mu3e Experiment

Search for the lepton-flavour violating decay
$\mu^+ \to e^+ e^+ e^-$


The Mu3e experiment is a new search for the lepton-flavour violating decay of a positive muon into two positrons and one electron. See here for a an overview of the experiment.

Mu3e craning in 2026

Mu3e craned into the area

Today Mu3e was craned from the staging setup to the PiE5 area, where the experiment was inserted into the Mu3e magnet.

Layer 3 pixel detector with installation crew

Layer 3 pixel modules installed

The third layer of the Mu3e pixel detector was sucessfully installed. This is the first time that we deploy these large pixel modules.

Mu3e Collaboration meeting September 2026 - Group Picture

Collaboration meeting at PSI

The Mu3e collaboration got together at PSI for two days of presentations and discussions.

Collaboration Server

(restricted access)