# Modified majoron model for cosmological anomalies

Barenboim, Gabriela; Nierste, Ulrich 1
1 Institut für Theoretische Teilchenphysik (TTP), Karlsruher Institut für Technologie (KIT)

## Abstract:

The vacuum expectation value v$_{s}$ of a Higgs triplet field Δ carrying two units of lepton number L induces neutrino masses ∝v$_{s}$. The neutral component of Δ gives rise to two Higgs particles, a pseudoscalar A and a scalar S. The most general renormalizable Higgs potential V for Δ and the Standard-Model Higgs doublet Φ does not permit the possibility that the mass of either A or S is small, of order v$_{s}$, while the other mass is heavy enough to forbid the decay Z→AS to comply with LEP 1 data. We present a model with additional dimension-6 terms in V, in which this feature is absent and either A or S can be chosen light. Subsequently we propose the model as a remedy to cosmological anomalies, namely the tension between observed and predicted tensor-to-scalar mode ratios in the cosmic microwave background and the different values of the Hubble constant measured at different cosmological scales. Furthermore, if Δ dominantly couples to the third-generation doublet L$_{τ}$=(v$_{τ}$,τ), the deficit of v$_{τ}$ events at IceCube can be explained. The singly and doubly charged triplet Higgs bosons are lighter than 280 GeV and 400 GeV, respectively, and could be found at the LHC.

 Zugehörige Institution(en) am KIT Institut für Theoretische Teilchenphysik (TTP) Publikationstyp Zeitschriftenaufsatz Publikationsjahr 2021 Sprache Englisch Identifikator ISSN: 2470-0010, 0556-2821, 1089-4918, 1538-4500, 1550-2368, 1550-7998, 2470-0029 KITopen-ID: 1000136130 Erschienen in Physical Review D Verlag American Physical Society (APS) Band 104 Heft 2 Seiten Art. Nr.: 023013 Vorab online veröffentlicht am 15.07.2021 Nachgewiesen in Web of ScienceDimensionsScopus
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