1106.0375 (Sandy S. C. Law)

Constraints on exotic lepton doublets with minimal coupling to the
standard model    [PDF]

Sandy S. C. Law

We investigate the consequences of introducing a set of exotic doublet
leptons which couple to the standard model leptons in a minimal way. Through
these additional gauge invariant and renormalizable coupling terms, new sources
of tree-level flavor changing currents are induced via mixing. In this work, we
derive constraints on the parameters that govern the couplings to the exotic
doublets by invoking the current low-energy experimental data on processes such
as leptonic Z decays, $\ell \rightarrow 3 \ell'$, $\ell \rightarrow \ell'
\gamma$, and $\mu$-$e$ conversion in atomic nuclei. Moreover, we have analyzed
the role these doublets play on the lepton anomalous magnetic moments, and
found that their contribution is negligible.

View original: http://arxiv.org/abs/1106.0375