Journal
NUCLEAR PHYSICS B
Volume 732, Issue 1-2, Pages 341-365Publisher
ELSEVIER
DOI: 10.1016/j.nuclphysb.2005.10.027
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We discuss the construction of chiral four-dimensional T-6/(Z(3) x Z(3)) orientifold compactifications of IIA theory, using D6-branes intersecting at angles and not aligned with the orientifold 06 planes. Cancellation of mixed U(l) anomalies requires the presence of a generalized Green-Schwarz mechanism mediated by RR partners of closed string untwisted moduli. In this respect we describe the appearance of three quark and lepton family SU(3)(C) x SU(2)(L) x U(1)(Y) non-supersymmetric orientifold models with only the massless spectrum of the SM at low energy that can have either no exotics present and three families of nu(R)'S (A'-model class) or the massless fermion spectrum of the N = 1 SM with a small number of massive non-chiral colour exotics and in one case with extra families of nu(R)'s (B'-model class). Moreover we discuss the construction of SU(5), flipped SU(5) and Pati-Salam SU(4)(c) x SU(2)(L) x SU(2)(R) GUTS-the latter also derived from adjoint breaking-with only the SM at low energy. Some phenomenological features of these models are also briefly discussed. All models are constructed with the Weinberg angle to be 3/8 at the string scale. (c) 2005 Elsevier B.V. All rights reserved.
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