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
Estelle (given name) with only a peripheral profile in Sweden - a 2012 year-end tally would estimate that a total of 663 Swedish residents bore the given name Estelle - touched off a flurry of media debate with writer Herman Lindqvist, who has acted as a historical consultant to the Swedish Royal Family, expressing the extreme negative position thus: "Totally unexpected and inappropriateNo name for a future rulerEstelle sounds like the name of a nightclub queen". Conversely top Scandinavian royalty pundit Kjell Arne Totland () reacted positively, calling Estelle "a very nice name, rich in tradition yet modern". Estelle (given name) Estelle is