Towards the Non-Chiral Extension of SM and MSSM

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 ${\alpha }_1$, ${\alpha }_2$ and ${\alpha }_S$ whereas in the SUSY case they can increase the unification point up to the string unification limit and decrease ${\alpha }_S(M_Z)$ down to the value predicted from the low energy physics.

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References in corpus (4)

• Observation of the Top Quark
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