CP violation: why not in K*, B* vector mesons?

[franoisbelfor]

Experimentalists have measured CP violation in neutral K and B mesons.
Everybody is unhappy that so far there are only 2 systems so
for which these measurements are possible.
(Neutral D mesons are predicted to show such a small effect that it
is probably unmeasurable for a long time.)
All these are spin 0 mesons.

But why is it not possible to test CP violation also in spin 1 mesons,
such as K* and B*? Is there a fundamental reason or is it simply that
experiments are too difficult?

François

 

[Vanadium 50]

The K* decays strongly and the B* decays electromagnetically, and CP violation is a phenomenon that occurs in weak decays.

 

[franoisbelfor]

The K* decays strongly and the B* decays electromagnetically, and CP violation is a phenomenon that occurs in weak decays.

Ah, thanks for the clarification. Could it then at least be possible to observe particle-antiparticle mixing, for the neutral K* and B*? Or is that also only visible in weak decays?

François

 

[Vanadium 50]

I'm afraid not.

Mixing is second-order weak. Neither the K* nor B* last long enough to observe this, by many orders of magnitude.