Intersecting D5-brane models with massive vector-like leptons

Abstract

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.

15 pages, LaTeX file

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• Conformal Field Theory Couplings for Intersecting D-branes on Orientifolds
• Intersecting Brane Worlds -- A Path to the Standard Model ?
• Supersymmetric Pati-Salam Models from Intersecting D6-branes: A Road to the Standard Model
• Interactions in Intersecting Brane Models
• N-point Amplitudes in Intersecting Brane Models
• D6-brane Splitting on Type IIA Orientifolds
• More Supersymmetric Standard-like Models from Intersecting D6-branes on Type IIA Orientifolds
• D-branes in Standard Model building, Gravity and Cosmology
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• Standard-like Models as Type IIB Flux Vacua
• Dynamical Supersymmetry Breaking in Standard-like Models with Intersecting D6-branes
• A Supersymmetric Flipped SU(5) Intersecting Brane World
• Standard-Like Model Building on Type II Orientifolds
• Flavour in Intersecting Brane Models and Bounds on the String Scale
• Flavour Changing Neutral Currents in Intersecting Brane Models
• A K-theory Anomaly Free Supersymmetric Flipped SU(5) Model from Intersecting Branes
• The open story of the magnetic fluxes
• Constraining the string scale: from Planck to Weak and back again
• Flipped SU(5) From D-branes With Type IIB Fluxes
• Aspects of Stability and Phenomenology in Type IIA Orientifolds with Intersecting D6-branes
• Deformed Intersecting D6-Brane GUTS and N=1 SUSY
• Quasi-Supersymmetric $G^3$ Unification from Intersecting D6-Branes on Type IIA Orientifolds
• Orientifold's Landscape: Non-Factorisable Six-Tori
• The Two Scales of New Physics in Higgs Couplings
• A Classification of Toroidal Orientifold Models
• Four-Family $\mathcal{N}=1$ Supersymmetric Pati-Salam Models from Intersecting D6-Branes