More Supersymmetric Standard-like Models from Intersecting D6-branes on Type IIA Orientifolds

TL;DR

This work extends the landscape of four-dimensional $N=1$ supersymmetric Standard-like models from Type IIA orientifolds by allowing D6-branes to wrap most general three-cycles on $T^6/(\mathbb{Z}_2\times\mathbb{Z}_2)$, including tilted tori. By systematically classifying supersymmetric brane configurations and computing intersection-based spectra, the authors present four three-family constructions (I.1–I.4) with reduced Higgs content and, in some cases, all three SM families arising from a single intersection, while preserving a hypercharge embedded within a left-right/Pati-Salam structure. A genuine left-right symmetric model is demonstrated, though it carries a sizable Higgs sector and extra exotics; additional semi-hidden gauge sectors offer potential for dynamical SUSY breaking and moduli stabilization. The results broaden the set of explicit SUSY Standard-like models and pave the way for further Yukawa-coupling and threshold-correction analyses in this framework.

Abstract

We present new classes of supersymmetric Standard-like models from type IIA $\IT^6/(\IZ_2\times \IZ_2)$ orientifold with intersecting D6-branes. D6-branes can wrap general supersymmetric three-cycles of $\IT^6=\IT^2\times \IT^2\times \IT^2$, and any $\IT^2$ is allowed to be tilted. The models still suffer from additional exotics, however we obtained solutions with fewer Higgs doublets, as well as models with all three families of left-handed quarks and leptons arising from the same intersecting sector, and examples of a genuine left-right symmetric model with three copies of left-handed and right-handed families of quarks and leptons.