" The term model is used in many communities with quite different traditions, commonly perceived problems, and purposes. To use the term properly therefore requires it being put into the right context . While this entry attempts to provide a general framework for talking about models it is not very likely that all communities would accept and use that framework. V. References [1] Stachowiak, H. ; "Modell" (In German); In: Seiffert, H. Handlexikon zur Wissenschaftstheorie; Deutscher Taschenbuch Verlag; 1989; pp. Model Naval Ship 219 - 222. [2] Wieringa, R. "

" Therefore, the Standard Model is often referred to as SU(3)×SU(2)×U(1). The Higgs boson is the only boson in the theory which is not a gauge boson; it has a special status in the theory, and has been the subject of some controversy. Gravitons, the bosons believed to mediate the gravitational interaction, are not accounted for in the Standard Model. There are twelve different types, or "flavours", of fermions in the Standard Model. Amongst the proton, neutron, and electron, those fermions which constitute the vast majority of matter, the Standard Model considers only the electron a fundamental particle. The proton and neutron are aggregates of smaller particles known as quarks, which are held together by the strong interaction. The fundamental fermions in the Standard Model are given in the table. Case Display Model Ship Table Left handed fermions in the Standard Model Fermion (Left-handed) Symbol Electric charge Weak charge* Weak isospin Hypercharge Color charge* Mass** Generation 1 Electron e -1 2 -1/2 -1/2 1 0. 511 MeV Electron neutrino νe 0 2 +1/2 -1/2 1 < 50 eV Positron ec 1 1 0 1 1 0. "