Intersecting D5-brane models with massive vector-like leptons

Details Intersecting D5-brane models with massive vector-like leptons Intersecting D5-brane models with massive vector-like leptons

2002-12-10

arxiv.org/abs/hep-th/0212112v1

JHEP 0302 (2003) 052

Physics

High Energy Physics

High Energy Physics - Theory

15 pages, LaTeX file

Scientific paper

10.1088/1126-6708/2003/02/052

We construct eight-stack intersecting D5-brane models, with an orbifold transverse space, that yield the (non-supersymmetric) standard model up to vector-like leptons. The matter includes right-chiral neutrinos and the models have the renormalisable Yukawa couplings to tachyonic Higgs doublets needed to generate mass terms for {\it all} matter, including the vector-like leptons. The models are constrained by the requirement that twisted tadpoles cancel, that the gauge boson coupled to the weak hypercharge $U(1)_Y$ does not get a string-scale mass via a generalised Green-Schwarz mechanism, and that there are no surviving, unwanted gauged U(1) symmetries coupled to matter. Gauge coupling constant ratios close to those measured are easily obtained for reasonable values of the parameters, consistently with having the string scale close to the electroweak scale, as required to avoid the hierarchy problem. Unwanted (colour-triplet, charged-singlet, and neutral-singlet) scalar tachyons can be removed by a suitable choice of the parameters.

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