Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-06-28
Phys.Lett.B545:153-161,2002
Physics
High Energy Physics
High Energy Physics - Phenomenology
References added, to appear in Phys. Lett. B
Scientific paper
10.1016/S0370-2693(02)02585-6
We construct a 5D SUSY SU(6) GUT on an $S^{(1)}/Z_2\tm Z_2'$ orbifold. The first stage of gauge symmetry breaking occurs through compactification and a specific selection of boundary conditions. Additional symmetries play a crucial role for the generation of $\mu $ and $B\mu $ terms of appropriate values: with a $SU(2)_{cus}$ custodial symmetry the Higgs doublets naturally emerge as massless pseudo-Goldstone bosons in the unbroken SUSY limit. After SUSY breaking they get masses of the order of the weak scale. If instead of $SU(2)_{cus}$ a discrete $Z_5$ symmetry is applied the Higgs doublet's masses are still adequately suppressed, but they are not pseudo-Goldstones. The $Z_5$ discrete symmetry also can be very important for GUT scale generation and an all order hierarchy. Fermion masses are naturally generated and nicely blend with additional symmetries. In the considered scenario unification of the three gauge couplings occurs near $10^{16}$ GeV.
Correia Filipe Paccetti
Schmidt Michael G.
Tavartkiladze Zurab
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