MEG-II detector

The MEG II experiment at PSI

The MEG experiment provides the most stringent charged lepton-flavour violation limit to date. It searches for the forbidden decay of a positive muon to a positron and photon. The second phase of the experiment has been collecting data since 2021, exploiting the world's most intense continuous muon beams at the Paul Scherrer Institute in Switzerland.

One of the potential discoveries of the muon may be the finding of the charged lepton flavour violation decays. In the standard model (SM) of particle physics, such processes are basically forbidden, with only an extremely small decay probability below one in 1050. Their search thus provides a powerful test of the SM at the high intensity frontier of physics.

The MEG II detector was constructed to reconstruct decays with a positron and a photon correlated by time, direction, and with energy that originated from the same muon. Narrowing the signal search region requires the best possible performance of tracking and calorimeter detectors operating in a high-rate environment. The ultra-low-mass Drift Chamber of the MEG II experiment provides precision tracking in  challenging pile-up conditions.

The Liverpool group is responsible for developing track pattern recognition algorithms to reconstruct detected events in the MEG experiment. 

Team Leader

  • Dr Fedor Ignatov

 

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