Testing Supersymmetry with Lepton Flavor Violating tau and mu decays

Abstract

In this work the following lepton flavor violating $\tau$ and $\mu$ decays are studied: ${\tau }^{-}\to {\mu }^{-}{\mu }^{-}{\mu }^{+}$, ${\tau }^{-}\to e^{-}{e}^{-}{e}^{+}$, ${\mu }^{-}\to e^{-}{e}^{-}{e}^{+}$, ${\tau }^{-}\to {\mu }^{-}\gamma$, ${\tau }^{-}\to e^{-}\gamma$ and ${\mu }^{-}\to e^{-}\gamma$. We work in a supersymmetric scenario consisting of the minimal supersymmetric standard model particle content, extended by the addition of three heavy right handed Majorana neutrinos and their supersymmetric partners, and where the generation of neutrino masses is done via the seesaw mechanism. Within this context, a significant lepton flavor mixing is generated in the slepton sector due to the Yukawa neutrino couplings, which is transmited from the high to the low energies via the renormalization group equations. This slepton mixing then generates via loops of supersymmetric particles significant contributions to the rates of $l_j\to 3l_i$ and the correlated $l_j\to l_i\gamma$ decays. We analize here in full detail these rates in terms of the relevant input parameters, which are the usual minimal supergravity parameters and the seesaw parameters. For the $l_j\to 3l_i$ decays, a full one-loop analytical computation of all the contributing supersymmetric loops is presented. This completes and corrects previous computations in the literature. In the numerical analysis compatibility with the most recent experimental upper bounds on all these $\tau$ and $\mu$ decays, with the neutrino data, and with the present lower bounds on the supersymmetric particle masses are required. Two typical scenarios with degenerate and hierarchical heavy neutrinos are considered. We will show here that the minimal supergravity and seesaw parameters do get important restrictions from these $\tau$ and $\mu$ decays in the hierarchical neutrino case.

Version to appear in Physical Review D

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