Low Energy Supersymmetry from the Heterotic Landscape
  We study possible correlations between properties of the observable and hidden sectors in heterotic string theory. Specifically, we analyze the case of the Z6-II orbifold compactification which produces a significant number of models with the spectrum of the supersymmetric standard model. We find that requiring realistic features does affect the hidden sector such that hidden sector gauge group factors SU(4) and SO(8) are favoured. In the context of gaugino condensation, this implies low energy supersymmetry breaking. 
Oleg Lebedev, Hans-Peter Nilles, Stuart Raby, Saul Ramos-Sanchez,   Michael Ratz, Patrick K. S. Vaudrevange, Akin Wingerter