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+ | ====== TTP09-38 Lepton flavour violation in the MSSM ====== | ||

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+ | <hidden TTP09-38 Lepton flavour violation in the MSSM > We derive new constraints on the quantities delta_{XY}^{ij, X,Y=L,R, | ||

+ | which parametrise the flavour-off-diagonal terms of the charged slepton | ||

+ | mass matrix in the MSSM. Considering mass and anomalous magnetic moment | ||

+ | of the electron we obtain the bound delta^{13}_{LL}*delta^{13}_{RR} < | ||

+ | 0.1, which involves the poorly constrained element delta^{13}_{RR}. We | ||

+ | improve the predictions for the decays tau -> mu gamma, tau -> e gamma | ||

+ | and mu -> e gamma by including two-loop corrections which are enhanced | ||

+ | if tan beta is large. The finite renormalisation of the PMNS matrix from | ||

+ | soft SUSY-breaking terms is derived and applied to the | ||

+ | charged-Higgs-lepton vertex. We find that the experimental bound on | ||

+ | BR(tau -> e gamma) severely limits the size of the MSSM loop correction | ||

+ | to the PMNS element U_{e3}, which is important for the proper | ||

+ | interpretation of a future U_{e3} measurement. Subsequently we confront | ||

+ | our new values for delta^{ij}_{LL} with a GUT analysis. As a novel | ||

+ | feature we consider dimension-5 Yukawa terms, which are needed to fix | ||

+ | the Yukawa unification of the first two generations. If universal | ||

+ | supersymmetry breaking occurs above the GUT scale, we find the flavour | ||

+ | structure of the dimension-5 Yukawa couplings tightly constrained by mu | ||

+ | -> e gamma. | ||

+ | </hidden> | ||

+ | |**Jennifer Girrbach, Susanne Mertens, Ulrich Nierste, Söoren Wiesenfeldt** | | ||

+ | | {{preprints:2009:ttp09-38.pdf|PDF}} {{preprints:2009:ttp09-38.ps|PostScript}} | | ||

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