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Electroweak breaking and Higgs boson profile in the simplest linear seesaw model

AuthorsFontes, D.; Romao, J. C.; Valle, J.W.F.
Issue DateOct-2019
PublisherInstitute of Physics Publishing
CitationJournal of High Energy Physics 2019, 10: 245 (2019)
AbstractWe examine the simplest realization of the linear seesaw mechanism within the Standard Model gauge structure. Besides the standard scalar doublet, there are two lepton-number-carrying scalars, a nearly inert SU(2) doublet and a singlet. Neutrino masses result from the spontaneous violation of lepton number, implying the existence of a Nambu-Goldstone boson. Such “majoron” would be copiously produced in stars, leading to stringent astrophysical constraints. We study the profile of the Higgs bosons in this model, including their effective couplings to the vector bosons and their invisible decay branching ratios. A consistent electroweak symmetry breaking pattern emerges with a compressed spectrum of scalars in which the “Standard Model” Higgs boson can have a sizeable invisible decay into the invisible majorons.
Publisher version (URL)http://dx.doi.org/10.1007/JHEP10(2019)245
Identifiersdoi: 10.1007/JHEP10(2019)245
issn: 1029-8479
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