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Paper   IPM / Physic / 13118
School of Physics
  Title:   Lepton Flavor Violation Shedding Light on CP-Violation
  Author(s):  Y. Farzan
  Status:   Books
  Year:  2012
  Pages:   211-226
  Supported by:  IPM
Search for Lepton Flavor Violating (LFV) rare decay μ ! e has played a key role in forming the standard model. Null result for searches was a hint for the fact that more than one type of neutrinos exist and e and μ are two distinct particles. Search for μ ! e is still a powerful tool to look for unknown physics. In fact, the present bound on Br(μ ! e) already probes energy scales that is beyond the reach of the LHC. The MEG experiment at PSI of Switzerland is currently collecting data to probe values of Br(μ ! e) two orders of magnitude below the present bound. If Br (μ ! e) is close to the present bound, the MEG collaboration will enjoy collecting large amount of data. Considering that decaying muons are almost 100 polarized, it would be possible to study the angular distribution of the fina particles and derive information on the parity structure of the underlying theory. Recently, it is shown that by measuring the polarization of the fina particles in μ ! e as well as in other lepton fl vor violating processes such as μ ! eee or μ−e conversion on nuclei, one can derive information on the CP-violating parameters of the underlying theory. Remembering that CP-violation is one of the key ingredients in explaining the fundamental question of matter antimatter asymmetry of the universe, the importance of such a measurement becomes more evident. We review this novel method in this chapter.

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