Topless Model for Grand Unification

  • Yoav Achiman
  • Berthold Stech
Part of the NATO Advanced Study Institutes Series book series (NSSB, volume 49)


A gauge model unifying weak, electromagnetic, and strong interactions is presented. It is based on the group SUL(3) ⊗ SUR(3) ⊗ SUC(3) ⊗ P with a complete flavor-color permutation symmetry. All fermions are in one irreducible representation of this group. This representation contains a’ new heavy lepton X and a new b-like quark h but no top quark besides u and c. The model has a global E6 ⊗ P symmetry before the local gauging i.e. in the limit of vanishing gauge coupling. A global SU(4) subgroup which may survive the spontaneous symmetry breaking leads to mass relations. The weak decays of b and h quarks can proceed through non-diagonal neutral currents providing for a specifice signature. The weak mixing angle is in accord with experiments.


Gauge Group Mass Relation Spontaneous Symmetry Breaking Higgs Field Permutation Symmetry 
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Copyright information

© Plenum Press, New York 1979

Authors and Affiliations

  • Yoav Achiman
    • 1
  • Berthold Stech
    • 1
  1. 1.Institut für Theoretische PhysikUniversität HeidelbergGermany

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