Comments on Charged Lepton Flavor Violation

Charged lepton flavor violation has been of interest since the muon (and subsequently, the tau lepton) was identified as a heavy version of the electron. CLFV continues to be pursued vigorously with the hope that its observation would reveal new information relating to the generation puzzle or about physics beyond the Standard Model. Theories abound which incorporate hypothetical CLFV at potentially observable levels although the mass scales and couplings are unknown, and innovative experiments continue to push the boundaries of sensitivity.