PT Journal
AU Fontes, D
   Romao, JC
   Valle, JWF
TI Electroweak breaking and Higgs boson profile in the simplest linear seesaw model
SO Journal of High Energy Physics
JI J. High Energy Phys.
PY 2019
BP 245
EP 28pp
VL 10
IS 10
DI 10.1007/JHEP10(2019)245
LA English
DE Beyond Standard Model; Higgs Physics; Neutrino Physics
AB We 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)(L) 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.
ER