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
Imogen (given name) Imogen (given name) Imogen , or Imogene, is an English-language female given name of uncertain etymology. Because the first recorded use of the name is by the English playwright William Shakespeare, it is popularly believed that he invented the name. It is chiefly used as a given name in the United Kingdom, Ireland, Canada, Australia, New Zealand, South Africa, Germany, Austria, the Netherlands, Belgium, Switzerland, and Scandinavian countries. The first recorded use of the name Imogen is by Shakespeare for a British princess in his play "Cymbeline". It is possible that the name may have originated as an accidental or