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Non-decoupling and lepton number violation in left-right models

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Non-decoupling and lepton number violation in left-right models

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Barenboim Szuchman, Gabriela Alejandra; Raidal, Martti

Aquest document és un/a article, creat/da en: 1997

We argue that large non-decoupling effects of heavy neutrinos can appear naturally in manifestly left-right symmetric models due to the minimization conditions of the scalar potential and the structure of vev's imposed by phenomenology. We derive constraints on off-diagonal light-heavy and heavy-heavy neutrino mixings from the searches for lepton violating decays mu --> e gamma, mu --> ee(-)e(+) and mu - e conversion in nuclei. The most stringent limits come from the latter process ee e because its amplitude shows a quadratic non-decoupling dependence on the heavy neutrino mass. Due to the suppression of right-handed currents by the large W-R mass the present experiments are not sensitive to the intergenerational mixings between heavy neutrinos if M(WR) > 200 TeV.

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