Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-09-04
Phys.Lett.B649:91-94,2007; Erratum-ibid.B655:91,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
Latex, 10 pages
Scientific paper
10.1016/j.physletb.2007.04.005;
Standard Model may be defined with the additional discrete symmetry, i.e. with the gauge group $SU(3)\times SU(2) \times U(1)/{\cal Z}$ (${\cal Z} = Z_6$, $Z_3$ or $Z_2$) instead of the usual $SU(3)\times SU(2) \times U(1)$. It has the same perturbation expansion as the conventional one. However, it may describe nature in a different way at the energies compared to the triviality bound (of about 1 Tev). In this paper we present a possibility to observe this difference assuming that the gauge group of the Standard Model is embedded into the gauge group of an {\it a priory} unknown model, which describes physics at a Tev scale. This difference is related to the monopole content of the theory. We illustrate our results by consideration of the Petite Unification of quarks and leptons.
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