Towards the Non-Chiral Extension of SM and MSSM
arXiv:hep-ph/9602399 · doi:10.1016/0370-2693(96)00273-0
Abstract
We show that in some SU(N) type GUTs with the complementary pairs of the conjugated fermion multiplets there naturally appear the relatively light ($M\ll M_{GUT}$) vectorlike fermions which considerably modify the desert physics. In the non-SUSY case they can provide for the unification of the standard coupling constant $α_1$, $α_2$ and $α_S$ whereas in the SUSY case they can increase the unification point up to the string unification limit and decrease $α_S(M_Z)$ down to the value predicted from the low energy physics.
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