Lepton flavour violation in the MSSM

  • Jennifer Girrbach
  • Susanne Mertens
  • Ulrich Nierste
  • Sören Wiesenfeldt


We derive new constraints on the quantities δXYij, 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 \( \left| {\delta_{LL}^{13}\delta_{RR}^{{13}}} \right| \lesssim 0.{1} \) for tan β = 50, which involves the poorly constrained element δRR13. We improve the predictions for the decays τμγ, τ and μ by including two-loop corrections which are enhanced if tan β 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(τ) severely limits the size of the MSSM loop correction to the PMNS element Ue3, which is important for the proper interpretation of a future Ue3 measurement. Subsequently we confront our new values for δLLij with a GUT analysis. Further, we include the effects of 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 μ.


Supersymmetry Phenomenology 


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Copyright information

© SISSA, Trieste, Italy 2010

Authors and Affiliations

  • Jennifer Girrbach
    • 1
  • Susanne Mertens
    • 1
    • 2
  • Ulrich Nierste
    • 1
  • Sören Wiesenfeldt
    • 1
    • 3
  1. 1.Institut für Theoretische Teilchenphysik, Karlsruhe Institute of TechnologyUniversität KarlsruheKarlsruheGermany
  2. 2.Institut für Experimentelle Kernphysik, Karlsruhe Institute of TechnologyUniversität KarlsruheKarlsruheGermany
  3. 3.Helmholtz AssociationBerlinGermany

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