More about the Standard Model at Intersecting Branes

Abstract

Intersecting D-brane models seem to be one of the most promising avenues to embed the Standard Model physics within the string context. We review here different aspects of these models. Topics include the question of SUSY and quasi-SUSY in intersecting brane models, model-building, the brane recombination interpretation of the SM Higgs mechanism, Yukawa couplings, the lowering of the string scale and possible new Z's accessible to accelerators.

Figures (7)

• Figure 1: The SM spectrum at intersecting branes.
• Figure 2: The general intersecting brane system may be embedded, e.g, into a general Calabi-Yau compact space.
• Figure 3: A square SUSY-quiver.
• Figure 4: Branes $b$ and $c$ are recombined into a single brane $f$. The gauge symmetry is reduced.
• Figure 5: The Yukawa couplings are computed from correlators involving a Higgs field, a right-handed fermion and a left-handed fermion. Open strings have to stretch in worldsheets of triangle shape. Those triangles have different size for different generations, leading to Yukawa textures and hierarchies (see ref.cim4).