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2009

Supersymmetric Lepton Flavour Violation in Low-Scale Seesaw Models

Ilakovac, Amon, Pilaftsis, Apostolos

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We study a new supersymmetric mechanism for lepton flavour violation in muon and tau decays and muon -> e conversion in nuclei, within a minimal extension of the MSSM with low-mass heavy singlet neutrinos and sneutrinos.

We find that the decays mu -> e gamma, tau -> e gamma and tau -> mu gamma are forbidden in the supersymmetric limit of the theory, whereas other processes, such as mu -> eee, mu -> e conversion, tau -> eee and tau -> e mu mu, are allowed and can be dramatically enhanced several orders of magnitude above the observable level by potentially large neutrino Yukawa coupling effects.
The profound implications of supersymmetric lepton flavour violation for present and future experiments are discussed.

Supersymmetric Lepton Flavour Violation in Low-Scale Seesaw Models · Around

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For the diagonal entries, we conservatively assume that Ω e e , μ μ , τ τ ∼ < 10 − 2 \Omega_{ee,\mu\mu,\tau\tau}\stackrel{{\scriptstyle<}}{{{}_{\sim}}}10^{-2} BK

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A. Ilakovac and A. Pilaftsis, in preparation

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We note that unlike the off-shell formfactors, physical amplitudes do not depend on the choice of the gauge

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See Appendix B.2 of Haber and Kane in Review

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We do not consider here the infra-red singular SUSY limit, without electroweak-symmetry breaking for μ ≠ 0 \mu\neq 0

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