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Free keywords:
High Energy Physics - Phenomenology, hep-ph,High Energy Physics - Experiment, hep-ex
Abstract:
New data on the lepton mixing angle $\theta_{13}$ imply that the $e\mu$
element of the matrix $m_\nu m_\nu^\dagger$, where $m_\nu$ is the neutrino
Majorana mass matrix, cannot vanish. This implies a lower limit on lepton
flavor violating processes in the $e\mu$ sector in a variety of frameworks,
including Higgs triplet models or the concept of minimal flavor violation in
the lepton sector. We illustrate this for the branching ratio of $\mu \to e
\gamma$ in the type II seesaw mechanism, in which a Higgs triplet is
responsible for neutrino mass and also mediates lepton flavor violation. We
also discuss processes like $\mu\to e\bar{e}e$ and $\mu\to e$ conversion in
nuclei. Since these processes have sensitivity on the individual entries of
$m_\nu$, their rates can still be vanishingly small.
