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

Abstract

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, $\ell \to 3{\ell }^{\prime }$, $\ell \to {\ell }^{\prime }\gamma$, 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.

18 pages, 1 figure, 2 tables (REVTeX4.1); v2: added discussions in Sec.II, III & IX and new ref. To appear in JHEP. arXiv admin note: text overlap with arXiv:1011.4730

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Cited by in corpus (3)

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• The signatures of the quintuplet leptons at the LHC