List of particles
Elementary particles are particles with no measurable internal structure; that is, they are not composed of other particles. They are the fundamental objects of quantum field theory . Many families and sub-families of elementary particles exist. Elementary particles are classified according to their spin . Fermions have half-integer spin while bosons have integer spin. All the particles of the Standard Model have been experimentally observed, recently including the Higgs boson . [1] [2] Fermions Main article: Fermion Fermions are one of the two fundamental classes of particles, the other being bosons . Fermion particles are described by Fermi–Dirac statistics and have quantum numbers described by the Pauli exclusion principle . They include the quarks and leptons, as well as any composite particles consisting of an odd number of these, such as all baryons and many atoms and nuclei. Fermions have half-integer spin; for all known elementary fermions this is 1 ⁄ 2 . All know...