Manchester Particle Physics Seminars, Colloquia and Meetings

Prof. Dr. Bernd Kniehl-Electroweak vacuum stability: gauge independence and advanced precision

Friday, 19 January 2018 from to (Europe/London)
at Schuster ( 54-6-6.40 - Niels Bohr Common Room )
Description
We perform a manifestly gauge-independent analysis of the vacuum stability
in the Standard Model (SM) including two-loop matching, three-loop
renormalization group evolution, and pure QCD corrections through four
loops. Exploiting our knowledge of the Higgs-boson mass, we derive an 
upper bound on the pole mass of the top quark by requiring that the SM be 
stable all the way up to the Planck mass scale and conservatively estimate 
the theoretical uncertainty. This bound is compatible with recent global
fits to top quark production data. We also briefly discuss cosmological 
consequences of this finding.