Large 2HDM(II) one-loop corrections in leptonic tau decays

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dc.creatorKrawczyk, M.
dc.creatorTemes, D.
dc.date2004-10-18
dc.date2005-01-31
dc.date.accessioned2026-07-07T12:26:30Z
dc.date.available2026-07-07T12:26:30Z
dc.descriptionThe one-loop contributions to the branching ratios for leptonic tau decays are calculated in the CP conserving 2HDM(II). We found that these one-loop contributions, involving both neutral and charged Higgs bosons, dominate over the tree-level H^+ exchange, the latter one being totally negligible for the decay into electron. The analysis is focused on large tanbeta enhanced contributions to the considered branching ratios. We derive a simple analytical expression for the one-loop contribution which holds in this case. We show that the leptonic branching ratios of tau are complementary to the Higgsstrahlung processes for h(H) and have a large potential on constraining parameters of the model. In this work we provide upper limits on Yukawa couplings for both light h and light A scenarios and we derive new lower limit on mass of M_{H^+} as a function of tanbeta, which differs significantly from what was considered as standard constraint based on the tree-level H^{+} exchange only. Interestingly we obtain also an upper limit on M_{H^+}. For a SM-like h scenario, with heavy and degenerate additional Higgs bosons, one-loop corrections disappear.
dc.description25 pgs. Figures and their descriptions improved, references added
dc.identifierhttps://arxiv.org/abs/hep-ph/0410248
dc.identifierhttp://arxiv.org/abs/hep-ph/0410248
dc.identifierEur.Phys.J.C44:435-446,2005
dc.identifierdoi:10.1140/epjc/s2005-02370-2
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/214899
dc.subjectHigh Energy Physics - Phenomenology
dc.titleLarge 2HDM(II) one-loop corrections in leptonic tau decays
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