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"Aspects of Lepton Flavour Violation in the MSSM "

Relatore: Dott.ssa Anna Rossi- Dip. di Fisica, Un. di Padova

Aula Einstein
11 Maggio 2004 ore 15.30

The Minimal Supersymmetric extension of the Standard Model (MSSM) is a natural framework where several signals of lepton flavour violation (LFV) could be significant, We consider in detail several $mu$-$ au$ LFV processes, namely $ au o mu X$ ($X=gamma, e^+ e^-, mu^+ mu^-, ho, pi, eta, eta'$), $Z o mu au$ and Higgs boson decays into $mu au$. First we present a model independent operator analysis relevant to such decays. Then we focus on the MSSM case, allowing slepton mass matrices to have large $mu$-$ au$ entries. We show how the rates and the mutual correlations of those LFV decays change in different regions of the MSSM parameter space. Values of the LFV branching ratios in the experimentally interesting range $10^{-9}-10^{-7}$ can be achieved. For at least two MSSM Higgs bosons, the branching ratio of the LFV decay into $mu au$ can reach values of order $10^{-4}$.