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Lepton Electric Dipole Moments in Non-Degenerate Supersymmetric Seesaw Models

John Ellis·Junji Hisano·Martti Raidal·Yasuhiro Shimizu
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Abstract

In the context of supersymmetric seesaw models of neutrino masses with non-degenerate heavy neutrinos, we show that Dirac Yukawa interactions N^c_i (Y_nu)_{ij} L_j H_2 induce large threshold corrections to the slepton soft masses via renormalization. While still yielding rates for lepton-flavour-violating processes below the experimental bounds, these contributions may increase the muon and electron electric dipole moments d_mu and d_e by several orders of magnitude. In the leading logarithmic approximation, this is due to three additional physical phases in Y_nu, one of which also contributes to leptogenesis. The naive relation d_mu/d_e\approx -m_mu/m_e is violated strongly in the case of successful phenomenological textures for Y_nu, and the values of d_mu and/or d_e may be within the range of interest for the future experiments.

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John Ellis, Junji Hisano, Martti Raidal, Yasuhiro Shimizu. 2001-11-30. Lepton Electric Dipole Moments in Non-Degenerate Supersymmetric Seesaw Models. https://doi.org/10.1016/s0370-2693(02)01197-8

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