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

Details Constraints on exotic lepton doublets with minimal coupling to the standard model Constraints on exotic lepton doublets with minimal coupling to the standard model

2011-06-02

arxiv.org/abs/1106.0375v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

18 pages, 1 figure, 2 tables (REVTeX4.1); v2: added discussions in Sec.II, III & IX and new ref. To appear in JHEP. arXiv admi

Scientific paper

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.

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