Is the CMK matrix a constant for all experimental energies?

[Spinnor]

Is the CMK matrix a constant for all experimental energies that we can presently explore?

Thanks for your help!

 

[Bill_K]

The CKM matrix gives ratios between weak decay rates, for example n → peν vs Λ → peν. There is no energy range involved.

 

[mitchell porter]

In the standard model these parameters do run with energy, e.g. see section 4.7 of http://arxiv.org/abs/hep-ph/9912358.

If such running has been observed it ought to be in http://pdg.lbl.gov/2011/reviews/rpp2011-rev-ckm-matrix.pdf" but I don't see it mentioned. It may just be too small to be seen.