### Abstract

Examples of supersymmetric grand unified models are explicitly illustrated, in which the Higgs doublets are identified, at the tree level, with the massless degrees of freedom describing an "accidental" degeneracy of the vacuum at the first stage of gauge symmetry breaking. This degeneracy occurs as a consequence either of the gauge symmetry or of a discrete exact symmetry. The effect of radiative corrections, which lift the vacuum degeneracy and break the SU (2) ⊗ U (1) group, is discussed, showing that the consistency of the theory, at low energy, only sets a rather weak and m_{t}-dependent lower bound on the lightest Higgs mass, with no constraint on the top-quark itself.

Original language | English (US) |
---|---|

Pages (from-to) | 137-142 |

Number of pages | 6 |

Journal | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics |

Volume | 312 |

Issue number | 1-2 |

DOIs | |

State | Published - Aug 5 1993 |

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### ASJC Scopus subject areas

- Nuclear and High Energy Physics

### Cite this

*Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics*,

*312*(1-2), 137-142. https://doi.org/10.1016/0370-2693(93)90501-8

**Back to the doublet-triplet splitting problem.** / Barbieri, R.; Dvali, G.; Moretti, M.

Research output: Contribution to journal › Article

*Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics*, vol. 312, no. 1-2, pp. 137-142. https://doi.org/10.1016/0370-2693(93)90501-8

}

TY - JOUR

T1 - Back to the doublet-triplet splitting problem

AU - Barbieri, R.

AU - Dvali, G.

AU - Moretti, M.

PY - 1993/8/5

Y1 - 1993/8/5

N2 - Examples of supersymmetric grand unified models are explicitly illustrated, in which the Higgs doublets are identified, at the tree level, with the massless degrees of freedom describing an "accidental" degeneracy of the vacuum at the first stage of gauge symmetry breaking. This degeneracy occurs as a consequence either of the gauge symmetry or of a discrete exact symmetry. The effect of radiative corrections, which lift the vacuum degeneracy and break the SU (2) ⊗ U (1) group, is discussed, showing that the consistency of the theory, at low energy, only sets a rather weak and mt-dependent lower bound on the lightest Higgs mass, with no constraint on the top-quark itself.

AB - Examples of supersymmetric grand unified models are explicitly illustrated, in which the Higgs doublets are identified, at the tree level, with the massless degrees of freedom describing an "accidental" degeneracy of the vacuum at the first stage of gauge symmetry breaking. This degeneracy occurs as a consequence either of the gauge symmetry or of a discrete exact symmetry. The effect of radiative corrections, which lift the vacuum degeneracy and break the SU (2) ⊗ U (1) group, is discussed, showing that the consistency of the theory, at low energy, only sets a rather weak and mt-dependent lower bound on the lightest Higgs mass, with no constraint on the top-quark itself.

UR - http://www.scopus.com/inward/record.url?scp=13844276503&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=13844276503&partnerID=8YFLogxK

U2 - 10.1016/0370-2693(93)90501-8

DO - 10.1016/0370-2693(93)90501-8

M3 - Article

VL - 312

SP - 137

EP - 142

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

SN - 0370-2693

IS - 1-2

ER -