Tau (particle) Tau (particle) The tau (τ), also called the tau lepton, tau particle, or tauon, is an elementary particle similar to the electron, with negative electric charge and a spin of. Together with the electron, the muon, and the three neutrinos, it is a lepton. Like all elementary particles with half-integer spin, the tau has a corresponding antiparticle of opposite charge but equal mass and spin, which in the tau's case is the antitau (also called the "positive tau"). Tau particles are denoted by and the antitau by . Tau leptons have a lifetime of and a mass of (compared to
Kennedy (given name) Kennedy (given name) Kennedy is a unisex given name in the English language. The name is an Anglicised form of a masculine given name in the Irish language. According to Patrick Hanks and Flavia Hodges, the given name "Kennedy" is an Anglicised form of "Cinnéidigh", a masculine given name in the Irish language. This Irish name is composed of two elements: the first, "ceann", means "head"; the second, "éidigh", means "ugly". According to Patrick Woulfe, who wrote in the early 19th century, "Kennedy or Kynidi" is an Anglicised form the Irish "Cinnéididh" and "Cinnéidigh". Woulfe derived these Irish names from