Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-11-05
Phys.Rev. D71 (2005) 065001
Physics
High Energy Physics
High Energy Physics - Phenomenology
14 pages, LaTeX
Scientific paper
10.1103/PhysRevD.71.065001
It is shown how grand unification can occur in models which are partly supersymmetric. The particle states which are composite do not contribute to the running of gauge couplings above the compositeness scale, while the elementary states contribute the usual large logarithmns. This introduces a new differential running contribution to the gauge couplings from partly composite SU(5) matter multiplets. In particular, for partly supersymmetric models, the incomplete SU(5) elementary matter multiplets restore gauge coupling unification even though the usual elementary gaugino and Higgsino contributions need not be present.
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