μ-e Conversion Versus μ-->e γ

Abstract

We compare two most relevant loop induced muon number violating processes, μ--> e γand μ-e conversion in nuclei, in constraining new physics. Because of much richer structure of the latter process it may be enhanced with respect to μ--> e γby a large $\ln (m_{\mu }^2/{\Lambda }^2),$ where $\Lambda$ is the scale of the new physics. After model-independent considerations we present two examples constraining the R-parity violating couplings of MSSM and the off-diagonal couplings of the doubly charged Higgs bosons from the non-observation of μ-e conversion.

Talk given in the workshop Valencia 97: "Physics Beyond the SM," Oct. 13-17, 1997, 6 pages