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
Passenger Movement Charge negative impact of the pilots' dispute of 1989. The departure tax was raised again in 1994 to A$25 to offset the additional cost of tourism promotion expenditure, specifically an additional A$80 million allocated to the development of new tourism products. Since its name change to passenger movement charge in 1995, the rate of the PMC has changed on several occasions. In most cases the Australian federal government has given a rationale for rate increases. Australia's departure tax is one of the highest in the world. Few jurisdictions levy taxes on departing international passengers, although some charge airport fees to cover