Searching for flavour violation in the charged lepton sector with the COMET experiment at JParc
Cristina Carloganu
LPC Clermont
Lundi 30/05/2022, 11:00-12:30
Bat 141, salle André Berthelot (143) , CEA Paris-Saclay

The Standard Model was brilliantly confirmed by the discovery of the Higgs and the last decade has also given us access to the neutrino mixing matrix. But the physics behind flavour violation remains unknown. The discovery of flavour violation in the charged lepton sector (cLFV) would unambiguously clarify it since the Standard Model contribution it is so suppressed that it becomes undetectable.

Muons are the source of a very large number of observables with high discovery potential for cLFV, be them rare decays or transitions. The availability nowadays of ultra-intense muon beams further increases their potential for  Beyond Standard Model searches. Among the muon observables, the neutrinoless μ-e conversion  is one of the cleanest from an experimental point of view and it allowed setting a limit on the conversion rate to  7×10-13  (SINDRUM-II, 2006).  We will see in the seminar how, despite this already impressive limit,  the COMET experiment at JParc (Japan) hopes to either  discover new physics, or to further improve the existing limit by no less than four orders of magnitude. We will focus on the constraints imposed by a low-energy precision measurement with the world's most intense muon beam and discuss in detail the French participation in the experiment. 


It will be held in person in room A. Berthelot. For those who cannot attend in person, there will also be a zoom connection, available at this link :

Contact : François BRUN


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