The one-loop contributions to the branching ratios for leptonic \documentclass[12pt]{minimal}
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\begin{document}$\tau$\end{document} decays are calculated in the CP-conserving 2HDM(II). The analysis is focused on large \documentclass[12pt]{minimal}
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\begin{document}$\tan \beta$\end{document} enhanced contributions. We found that these contributions, involving loops with both neutral and charged Higgs bosons, dominate over the tree-level \documentclass[12pt]{minimal}
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\begin{document}$H^{\pm}$\end{document} exchange, the latter one being totally negligible for the decay into e. We derive a simple analytical expression for the one-loop contribution which holds in the large \documentclass[12pt]{minimal}
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\begin{document}$\tan \beta$\end{document} case. We show that the leptonic branching ratios of \documentclass[12pt]{minimal}
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\begin{document}$\tau$\end{document} are complementary to the Higgsstrahlung processes for h(H) and have a large potential in constraining the parameters of the model. In this work we provide upper limits on the Yukawa couplings for both light h and light A scenarios, and we derive a new lower limit on the mass of \documentclass[12pt]{minimal}
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\begin{document}$H^\pm$\end{document} as a function of \documentclass[12pt]{minimal}
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\begin{document}$\tan \beta$\end{document} which differs significantly from what was considered as a standard constraint based on the tree-level \documentclass[12pt]{minimal}
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\begin{document}$H^{\pm}$\end{document} exchange only. Interestingly we also obtain an upper limit on \documentclass[12pt]{minimal}
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\begin{document}$M_{H^\pm}$\end{document}.
