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
Scarlett (given name) Scarlett (given name) Scarlett is a feminine name derived from an English surname with an occupational meaning, referring to a person who sold cloth of scarlet. It gained popularity due to the character Scarlett O'Hara in Margaret Mitchell's best-selling novel "Gone with the Wind" and the film adaptation. The name was the 17th most popular name given to baby girls in the England and Wales in 2013 and the 30th most popular name given to baby girls in the United States in 2014. The name also has associations with the bright red color scarlet and, indirectly, with the Biblical scarlet