4.7 Article

New parametrization of the seesaw mechanism and applications in supersymmetric models

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PHYSICAL REVIEW D
卷 66, 期 11, 页码 -

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AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.66.115013

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We present a new parametrization of the minimal seesaw model, expressing the heavy-singlet neutrino Dirac Yukawa couplings (Y-nu)(ij) and Majorana masses M-Ni in terms of effective light-neutrino observables and an auxiliary Hermitian matrix H. In the minimal supersymmetric version of the seesaw model, the latter can be related directly to other low-energy observables, including processes that violate charged lepton flavor and CP. This parametrization enables one to respect the stringent constraints on muon-number violation while studying the possible ranges for other observables by scanning over the allowed parameter space of the model. Conversely, if any of the lepton-flavor-violating process is observed, this measurement can be used directly to constrain (Y-nu)(ij) and M-Ni. As applications, we study flavor-violating tau decays and the electric dipole moments of leptons in the minimal supersymmetric seesaw model.

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