Precise predictions for h_a --> h_b h_c decays in the complex MSSM

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dc.creatorWilliams, K. E.
dc.creatorWeiglein, G.
dc.date2007-10-28
dc.date2008-01-17
dc.date.accessioned2026-07-07T11:53:50Z
dc.date.available2026-07-07T11:53:50Z
dc.descriptionComplete one-loop results for the decay widths of neutral Higgs bosons (h_a) into lighter neutral Higgs bosons (h_b, h_c) are presented for the MSSM with complex parameters. The results are obtained in the Feynman-diagrammatic approach, taking into account the full dependence on the spectrum of supersymmetric particles and all complex phases of the supersymmetric parameters. The genuine triple-Higgs vertex contributions are supplemented with two-loop propagator-type corrections, yielding the currently most precise prediction for this class of processes. The genuine vertex corrections turn out to be very important, yielding a large increase of the decay width compared to a prediction based on the tree-level vertex. The new results are used to analyse the impact of the experimental limits from the LEP Higgs searches on the parameter space with a very light MSSM Higgs boson. It is found that a significant part of the parameter space of the CPX benchmark scenario exists where channels involving the decay h_2 --> h_1 h_1 have the highest search sensitivity, and the existence of an unexcluded region with M_{h_1} \approx 45 GeV is confirmed.
dc.description16 pages, minor corrections, version accepted in Physics Letters B
dc.identifierhttps://arxiv.org/abs/0710.5320
dc.identifierhttp://arxiv.org/abs/0710.5320
dc.identifierPhys.Lett.B660:217-227,2008
dc.identifierdoi:10.1016/j.physletb.2007.12.049
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/204687
dc.subjectHigh Energy Physics - Phenomenology
dc.titlePrecise predictions for h_a --> h_b h_c decays in the complex MSSM
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