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In this letter we analyze the relative scales for the GUT and twin sectors inthe F-theory model discussed in Ref. \cite{Clemens-3}. There are a number ofvolume moduli in the model. The volume of the GUT surface in the visible sector{[}sector(1){]} (with the Wilson line GUT breaking) defines the GUT scale$M_{GUT}\sim2\times10^{16}~GeV$ as the unification scale with precise gaugecoupling unification of $SU(3)\times SU(2)\times U(1)_{Y}$. We choose$\alpha_{GUT}^{-1}\sim24$. We are then free to choose the ratio$\alpha_{G}(2)/\alpha_{G}(1)=m_{1}/m_{2}$ with $m(1)$ and $m(2)$ independentvolume moduli associated with the directions perpendicular to the two GUTsurfaces. We then analyze the effective field theory of the twin sector(2),which may lead to a SUSY breaking gaugino condensate. Of course, all theseresults are subject to the self-consistent stabilization of the moduli.

Relative Scales of the GUT and Twin Sectors in an F-theory model