Spontaneous breaking of a global symmetry in a 331 model

Details Spontaneous breaking of a global symmetry in a 331 model Spontaneous breaking of a global symmetry in a 331 model

1999-03-03

arxiv.org/abs/hep-ph/9903251v2

Phys.Rev. D60 (1999) 115003

Physics

High Energy Physics

High Energy Physics - Phenomenology

RevTex, 10 pages, one .eps figure

Scientific paper

10.1103/PhysRevD.60.115003

In a 331 model in which the lepton masses arise from a scalar sextet it is possible to break spontaneously a global symmetry implying in a pseudoscalar majoron-like Goldstone boson. This majoron does not mix with any other scalar fields and for this reason it does not couple, at the tree level, neither to the charged leptons nor to the quarks. Moreover, its interaction with neutrinos is diagonal. We also argue that there is a set of the parameters in which that the model can be consistent with the invisible Z^0-width and that heavy neutrinos can decay sufficiently rapid by majoron emission having a lifetime shorter than the age of the universe.

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