Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-09-29
Nucl.Phys. B622 (2002) 215-226
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 pages, 6 figures, LaTeX
Scientific paper
10.1016/S0550-3213(01)00593-4
We investigate the proposed ``D-brane alternative'' to the MSSM model (DMSSM) which is a type II B string orientifold model with N=1 supersymmetry, three generations and a $SU(3)\times SU(2)_R\times SU(2)_L \times U(1)_{B-L}$ gauge group. An accurate analysis at two-loop level is performed to show that unification constraints predict a ``left-right'' symmetry breaking scale in the TeV region. The exact value of this scale is the result of the competing effects of the two loop terms against the low energy supersymmetric threshold effects. The model accommodates logarithmic unification of the gauge couplings at an intermediate scale of $10^{12}$ GeV and the necessary conditions to achieve this are addressed.
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