Sala 422 12:15 
Seminarium Instytutu

dr Kazuki Sakurai, UW

A fresh look at the gauge coupling unification and proton decay

In this talk I will review the success of the gauge coupling unification in the minimal supersymmetric (SUSY) extension of the Standard Model. We will see that in order to quantitatively address the coupling unification, one must take into account the effect of mass splitting both in SUSY (m ~ TeV) and Grand Unified Theory (GUT) (m ~ 10^16 GeV) sectors, known as threshold corrections. I will develop convenient mathematical formulae to ensure the coupling unification, and use them to predict the proton lifetime to constrain the low energy SUSY spectra in a given GUT model. We will see there is an interesting complementarity between the proton decay experiments and the direct SUSY searches at the LHC.