Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-04-13
Phys.Lett.B484:355-361,2000
Physics
High Energy Physics
High Energy Physics - Phenomenology
Latex2e, 11 pages, 1 figure
Scientific paper
10.1016/S0370-2693(00)00650-X
In the four-dimensional supersymmetric standard model extended with gauge singlets the lightest Higgs boson mass, $M_H$, has an important contribution proportional to the squared of the superpotential coupling $\lambda$ of singlets to Higgs fields, $\lambda SH_1\cdot H_2$. The requirement of perturbativity up to the unification scale yields an upper bound on $M_H\sim 140$ GeV. In extensions to theories with (longitudinal) extra dimensions at the TeV where such coupling exists and massive Kaluza-Klein states fall into N=2 representations, if either of the Higgs or singlet fields live in the bulk of the extra dimensions, the $\beta$-function of $\lambda$ is suppressed due to the absence of anomalous dimension of hypermultiplets to leading order. This implies a slower running of $\lambda$ and an enhancement of its low energy value. The $M_H$ upper bound increases to values $M_H\lesssim 165$ GeV.
Delgado Antonio
Quiros Mariano
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