ABSTRACT
This chapter discusses the basic features of the current Standard Model of elementary particle physics. As the main interest lies in neutrinos, the focus is on the weak or the more general electroweak interaction. The chapter discusses in more detail the non-Abelian gauge theories of the electroweak and strong interaction, which are unified in the Standard Model of elementary particle physics. The Standard Model predictions are about 5 or 10 orders of magnitude smaller respectively, but nevertheless these limits impose strong constraints on Beyond Standard Model physics. Although it has been extraordinarily successful, not everything can be predicted by the Standard Model. In fact it has 18 free parameters as input, all of which have to be measured. This is excluding neutrino masses and mixing. The Higgs sector might get more complicated as more Higgs particles could be involved. This is predicted in several extensions of the Standard Model like the minimal supersymmetric Standard Model.
