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A standard model is formulated in a Weyl space, $W_4$, yielding a Weylcovariant dynamics of massless chiral Dirac fermion fields for leptons andquarks as well as the gauge fields involved for the groups D(1)\,(Weyl),$U(1)_Y{\times} SU(2)_W$\,(electroweak), $SU(3)_c$\,(colour),SO(3,1)\,(gravity) and SO(4,1)\,(strong interaction, symmetry breaking). Thedynamics is based on a gauge and Weyl invariant Lagrangean density ${\cal L}$.Gravitation is included from the beginning as the gauge aspect of the Lorentzgroup which is here extended in the hadronic sector of the model to the tenparameter SO(4,1) de Sitter group. A part of the dynamics is, as usual, ascalar isospinor field $\phi$ being a section on a bundle related to theelectroweak gauge group and to symmetry breaking. In parallel to $\phi$ on theleptonic side a section $\tilde\xi^a$ on the hadronic side is considered aspart of the dynamics, governing the symmetry breaking $SO(4,1)\longrightarrowSO(3,1)$ and recovering gravitation in the symmetry breaking limit outside theregions in space-time where strong interactions persist. Besides spin, isospinand helicity the Weyl weights determine the form of the contributions of fieldsin ${\cal L}$. Of particular interest is the appearance of a current-currentself-interaction of quark fields allowed by the Weyl weight changing the debateabout quark masses. In a second step the D(1)-Weyl symmetry is explicitlybroken and a universal mass scale is established through the mass of the$\phi$-field appearing in the symmetry breaking Lagrangean ${\cal L}_B$. TheWeyl symmetry breaking is governed by the relation $D_\mu \Phi^2{=}0$, where$\Phi$ is the norm of $\phi$. After D(1) symmetry breaking the masses of theweak bosons and of the electron appear on the scene through the energy-momentumtensor of the $\phi$-field.

Weyl Invariant Standard Model and its Symmetry Breaking