A '''lepton''' is a [[fermion]], meaning that it is an elementary particle with half-integer spin. Leptons consist of several types of electrons, such as the tau electron; along with [[quark]]s, leptons matter constituents. | A '''lepton''' is a [[fermion]], meaning that it is an elementary particle with half-integer spin. Leptons consist of several types of electrons, such as the tau electron; along with [[quark]]s, leptons matter constituents. |