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  Muon Decay and Physics Beyond the Standard Model



The current theoretical and experimental status of the particle-physics field of muon decay and its potential to search for new physics beyond the standard model are studied. The rare muon processes with lepton flavor violation become important and attract much theoretical and experimental interest, together with precision measurements of normal muon decay. Recent up-to-date motivations of (charged) lepton flavor violation based on supersymmetric models, where it occurs through the mixing of sleptons. In particular, supersymmetric grand unified theories and minimum supersymmetric models with see-saw models are studied along with other theoretical models.

Future prospects of experiments and muon sources of high intensity for further progress in this field are discussed. In particular, possibility of a highly intense muon source based on techniques of the front-end of a future neutrino factory is being discussed, where the beam intensity of more than 10,000 times the currently available can be anticipated. One example is the PRISM (=Phase Rotated Intense Slow Muon source) project proposed by the Osaka-university group in Japan. With this new facility, improvement of more than 4 orders of magnitude can be expected in search for lepton-flavor violating muon processes.

*Reprinted from Rev. of Mod. Phys., 73, KUNO, Y., OKADA, Y.,
151-202, Copyright 2001, with permission from the American Physical Society.


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