Fermion mass mixing and Higgs boson width at Next-to-Leading Order

Abstract

In this master’s thesis, we study two issues. The first is the fermion mass mixing and the second is the Higgs boson decay. All of this is within the framework of the Electro-Weak theory of the Standard Model. We review both the mixing and the Higgs mechanism to study the effect of the mixing on the Higgs boson decay. In addition for that purpose, It was necessary to go through the process of renormalization in order to get rid of any ultraviolet divergence. The study is executed at one loop level by using special calculation tools under the Mathematica program, that are FormCalc, FeynCalc and FeynArt. Keywords: EWSM, Higgs Boson decay, Mass mixing, FormCalc, FeynCalc and FeynArt.