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- W4300167248 abstract "In the {sl type II seesaw} model, if spontaneous violation of the lepton number conservation prevails over that of explicit violation, a rich Higgs sector phenomenology is expected to arise with light scalar states having mixed charged-fermiophobic/neutrinophilic properties. We study the constraints on these light CP-even ($h^0$) and CP-odd ($A^0$) states from LEP exclusion limits, combined with the so far established limits and properties of the $125-126$~GeV ${cal H}$ boson discovered at the LHC. We show that, apart from a fine-tuned region of the parameter space, masses in the $sim 44$ to $80$ GeV range escape from the LEP limits if the vacuum expectation value of the Higgs triplet is $lesssim {cal O}(10^{-3})$GeV, that is comfortably in the region for 'natural' generation of Majorana neutrino masses within this model. In the lower part of the scalar mass spectrum the decay channels ${cal H} to h^0 h^0, A^0 A^0$ lead predominantly to heavy flavor plus missing energy or to totally invisible Higgs decays, mimicking dark matter signatures without a dark matter candidate. Exclusion limits at the percent level of these (semi-)invisible decay channels would be needed, together with stringent bounds on the (doubly-)charged states, to constrain significantly this scenario. We also revisit complementary constraints from ${cal H} to gamma gamma$ and ${cal H} to Z gamma$ channels on the (doubly)charged scalar sector of the model, pinpointing non-sensitivity regions, and carry out a likeliness study for the theoretically allowed couplings in the scalar potential." @default.
- W4300167248 created "2022-10-03" @default.
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- W4300167248 date "2014-11-20" @default.
- W4300167248 modified "2023-09-26" @default.
- W4300167248 title "Type II Seesaw Higgsology and LEP/LHC constraints" @default.
- W4300167248 doi "https://doi.org/10.48550/arxiv.1411.5645" @default.
- W4300167248 hasPublicationYear "2014" @default.
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