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## Homework Statement

Consider weak interactions of quarks involving the Z

^{0}bosons. Show that there is no d → s + Z

^{0}interaction in the Standard Model.

## Homework Equations

(d') = (cosθ sinθ) (d)

(s') (-sinθ cosθ) (s)

This is the change of variables matrix.

θ is the Cabibbo angle, with the rotation matrix on the down and strange quark

## The Attempt at a Solution

I'm not sure how to prove this, I think it may be something to do with that there is a sinθ x both d and s if you're doing the transformation so they're both suppressed? But that's a wild guess, my knowledge isn't that deep on this matter.

Thank for any help, much appreciated!