Supersymmetric standard models on D-branes

Type IIB superstring models with the standard model gauge group on D3-branes and with massless matter associated with open strings joining D3-branes to D3-branes or D3-branes to

{\rm D}7_3

-branes are studied. Models with gauge coupling constant unification at an intermediate scale between about

10^{10}

and

10^{12}

GeV and consistency with the observed value of

\sin^2 \theta_W (M_Z)

are obtained. Extra vector-like states and extra pairs of Higgs doublets play a crucial role.

Note:

10 pages, LaTeX file, version to appear in Phys.Lett.B Report-no: SUSX-TH-00-017, RHCPP 00-03T

membrane model: D-brane
membrane model: p-brane
p-brane: 3
string model
supersymmetry: multiplet
grand unified theory
symmetry breaking
group theory: representation
Higgs particle: multiplet
Weinberg angle

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Figures(0)

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