positive. The (mass)$^2$ of the charged scalar reads

$$m_{H^{+}}^{2}=M_{W}^{2}\left( 1-\frac{\lambda ^{2}}{g_{2}^{2}}\right)
+\left| \hat{B}\hat{\mu}\frac{h_{1}^{2}+h_{2}^{2}}{h_{1}h_{2}}\right|
\label{N}$$

The radiative corrections are incorporated into the CP odd neutral and charged scalar masses through the shift of the $\hat{B}$ parameter as defined in (\[K\]) [@Elrc].

Although all the numerical results in this paper are obtained by numerical minimization of the complete one loop potential (\[F\]), (\[G\]) and the numerical determination of the mass eigenvalues, it is interesting to get some insight into the results through simple analytic approximations. Indeed, many features of the particle spectrum of the (M+1)SSM are related to an important property, first noticed in [@ERS1], namely: the only physically acceptable solutions of the vacuum equations (\[I\]) are large singlet solutions: $ s \gtrsim 1\mathrm{TeV}\gg 
h_{2},h_{1}.$ Indeed, solutions with $ s \lesssim h_{2}$ lead to one or more light states in the spectrum that are excluded by experiments, specially by LEP experiments. Examples can be found in [@Ellis], where the parameters have been chosen to yield light spectrum. The general character of this feature of the (M+1)SSM has been carefully checked in our numerical analysis. Having settled this fact one can go on to establish several approximate consequences.

\(A) The $S$ v.e.v is 