Heterotic road to the MSSM with $R$ parity
Oleg Lebedev, Hans Peter Nilles, Stuart Raby, Sa\ ' { u} l Ramos-S\'{a}nchez, Michael Ratz, Patrick K. S. Vaudrevange, and Ak{ \ i} n Wingerter

{ In a previous paper, referred to as a ``Mini-Landscape" search, we explored a ``fertile patch" of the heterotic landscape based on a \Z6-II orbifold with SO(10) and \E6 local GUT structures. In the present paper we extend this analysis. We find many models with the minimal supersymmetric standard model spectra and an exact R parity. In all of these models, the vector-like exotics decouple along D flat directions. We present two ``benchmark" models which satisfy many of the constraints of a realistic supersymmetric model, including non-trivial Yukawa matrices for 3 families of quarks and leptons and Majorana masses for right-handed neutrinos with non-trivial See-Saw masses for the 3 light neutrinos. In an appendix we comment on the important issue of string selection rules and in particular the so-called ``gamma-rule". }

© 2008 The American Physical Society.