in (\[B\]), with $%
Q_3=(T,B),$ but similar interactions for all other squarks and sleptons are to be understood. All the parameters are taken to be real (up to irrelevant phases) and flavour mixing is neglected. Notice that these soft terms contain all the dimensionful parameters of the model, which are all naturally related to the supersymmetry breaking scale $M_{\mathrm{susy}}$. In order to study the particle spectrum and $SU(2)\times U(1)$ symmetry breaking in the (M+1)SSM, one should take the parameters in (\[A\]) and (\[B\]) at the relevant scales, the Fermi scale $v=174$ [GeV]{} or $ M_{\mathrm{susy}}.$ Instead, it is natural to fix these parameters at the level of the underlying supergravity theory. We shall consider here the unification scale $\Lambda_{\mathrm{GUT}}\sim 10^{16}$ GeV to define them. This is just a few orders of magnitude below the Planck mass and one can presumable assume an effective renormalizable theory at $\Lambda_{\mathrm{GUT}}.$ Once the parameters are given at $\Lambda_{\mathrm{GUT}},$ their corresponding values at $v$ or $M_{% 
\mathrm{susy}}$ are calculated by the integration of the renormalization group equations (RGE) for the (M+1)SSM [@Desa]. We present in the appendix the analytic solutions of the (M+1)SSM RGE in the approximation $h_{t}^{2}\gg  \lambda ^{2},\kappa ^{2},$ which turns out to 