fermionFermion22008-03-25 18:32:452008-03-25 18:32:45Definition% this is the default PlanetPhysics preamble. as your knowledge
% of TeX increases, you will probably want to edit this, but
% it should be fine as is for beginners.
% almost certainly you want these
\usepackage{amssymb}
\usepackage{amsmath}
\usepackage{amsfonts}
% used for TeXing text within eps files
%\usepackage{psfrag}
% need this for including graphics (\includegraphics)
%\usepackage{graphicx}
% for neatly defining theorems and propositions
%\usepackage{amsthm}
% making logically defined graphics
%\usepackage{xypic}
% there are many more packages, add them here as you need them
% define commands hereFermions are particles with half integer ($1/2$, $3/2$, $5/2$ etc) spin. They are governed by the Pauli exclusion principle, meaning that no two fermions can occupy the same quantum state. From this principle, it is possible to derive the Fermi-Dirac distribution to derive non-interacting fermions. In the standard model of particle physics, there are 24 fermions: the 12 quarks and antiquarks, and the 12 leptons and anti-leptons.