electroweak symmetry unbreaking?

[arivero@unizar.es]

The neutral and scalar pions have very different decay rate because of
Fermi constant, ie because of electroweak symmetry breaking.

Now, suppose we vary the parameters in higgs potential so that the
electroweak vacuum becomes smaller, until eventually the symmetry is
restored. How must we notice this symmetry restoration? Will it happen
exactly when both decay rates are equal? Will the decay rate via beta
decay become eventually higher than the electromagnetic decay rate?
Will Z0 start to contribute to the neutral decay, so avoiding the meet
of both decays?

(It seems a very interesting practice, I wonder if it is done
somewhere, perhaps in the Amer J Phys)

Alejandro

[arivero@unizar.es]

Thinking a bit more about this, it seems interesting to note that
SU(2)xU(1) is doubly broken.

Not only that the higgs vacuum is not invariant under the symmetry, but
also the couplings to particles in the same multiplet are different. So
there are two different scales in the theory, one restoring the vacuum,
another one restoring the multiplets.


arivero@unizar.es wrote:
> The neutral and scalar pions have very different decay rate because of
> Fermi constant, ie because of electroweak symmetry breaking.
>
> Now, suppose we vary the parameters in higgs potential so that the
> electroweak vacuum becomes smaller, until eventually the symmetry is
> restored. How must we notice this symmetry restoration? Will it happen
> exactly when both decay rates are equal? Will the decay rate via beta
> decay become eventually higher than the electromagnetic decay rate?
> Will Z0 start to contribute to the neutral decay, so avoiding the meet
> of both decays?
>
> (It seems a very interesting practice, I wonder if it is done
> somewhere, perhaps in the Amer J Phys)
>
> Alejandro