Standard Model beta-functions to three-loop order and vacuum stability
  Since the discovery of a Higgs particle the effective Higgs potential of the Standard Model or extensions and the stability of the ground state corresponding to its minimum at the electroweak scale have been subject to a lot of investigation. The vacuum expectation value of the scalar SU(2) doublet field in the Standard Model, which is responsible for the masses of elementary particles, may in fact not be at the global minimum of the effective Higgs potential. The question whether there is a deeper minimum at some large scale is closely linked to the behaviour of the running quartic Higgs self-interaction $\lambda(\mu)$. In this talk an update on the analysis of the evolution of this coupling is given. We use three-loop beta-functions for the Standard Model couplings, two-loop matching between on-shell and MSbar quantities and compare the theoretical precision achieved in this way to the precision in the latest experimental values for the key parameters. 
Max F. Zoller
hep-ph