Getting just the Standard Model at Intersecting Branes

Details Getting just the Standard Model at Intersecting Branes Getting just the Standard Model at Intersecting Branes

2001-05-16

arxiv.org/abs/hep-th/0105155v2

JHEP 0111:002,2001

Physics

High Energy Physics

High Energy Physics - Theory

References added, some typos corrected and a comment about axionic couplings included

Scientific paper

We present what we believe are the first specific string (D-brane) constructions whose low-energy limit yields just a three generation $SU(3)\times SU(2)\times U(1)$ standard model with no extra fermions nor U(1)'s (without any further effective field theory assumption). In these constructions the number of generations is given by the number of colours. The Baryon, Lepton and Peccei-Quinn symmetries are necessarily gauged and their anomalies cancelled by a generalized Green-Schwarz mechanism. The corresponding gauge bosons become massive but their presence guarantees automatically proton stability. There are necessarily three right-handed neutrinos and neutrino masses can only be of Dirac type. They are naturally small as a consequence of a PQ-like symmetry. There is a Higgs sector which is somewhat similar to that of the MSSM and the scalar potential parameters have a geometric interpretation in terms of brane distances and intersection angles. Some other physical implications of these constructions are discussed.

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