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
Aodh (given name) Aodh (given name) Aodh (; ) is an Irish and Scottish Gaelic male given name, originally meaning "fire". Feminine forms of the name include Aodhnait and Aodhamair. It appears in even more variants as a surname. As a surname, the root or a variant may be prefixed by "O", "Ó", or "Ui" (meaning "from" or "descendant of"), "Mac" or "Mc" (meaning "son of"), or "Nic" (meaning "daughter of"). The name was originally related to an Irish god of the underworld. The masculine given name Hugh is a common anglicization, although the names are not etymologically linked (see Hughes (surname), Hughes