Description
The standard model of particle physics is far from accounting
for mysteries about our universe, --e.g., what is dark matter and dark
energy?-- and it must be extended to a more fundamental description
of nature. Such new physics models allow Lepton Flavor Violating (LFV)
reactions (e.g., muon decays into an electron and a photon) which are
exactly forbidden in the standard model. Hence search for LFV is a clue
to the new physics, which unveil the flavor structure and the symmetries
behind it. In this talk, the general features of the LFV processes are
introductory reviewed, and theoretical and experimental progresses are
discussed.
