The substructure of the weak bosons and the weak mixing angle

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In models in which the weak intermediate bosons are bound states consisting of spin 1 2 constituents the effective neutral current mixing angle sin 2θ W is related to the W wave function at the origin. Dynamical constraints for the bound state structure of the W-boson follow. Although the observed value of sin 2θ W is rather large, it seems possible to obtain the observed value in a dynamical mixing scheme. The weak bosons are extended objects, whose sizes are of the order of 10 −16 cm.