Tau (particle)

τ - lepton

The τ - lepton (read " tau lepton " ), tauon or τ - particles is the heaviest of the three charged leptons of the Standard Model of elementary particles. Its mass is 1.777 GeV/c2, which is about the 3500 times its easy Schwesterteilchens, the electron. Its lifetime is 2.906 ± 0.010 · 10-13 s

The name tauon, or letter τ, was named after the Greek word for Third ( τρίτην, Triton ) chosen because the τ - lepton is the third -charged electron- like particles. It was discovered by Martin L. Perl and his colleagues at SLAC in an electron-positron collision in the SPEAR ring in 1975. In particular, for this discovery Perl was awarded the Nobel Prize for Physics in 1995.

The τ - lepton can both decay into the lighter leptons

As well as in various hadrons, such as Pions or kaons. Here is a selection of the numerous decay channels:

The composition of the quark mesons most frequently involved are:

These mesons are pseudoscalar mesons with total spin 0 and odd parity. It can also vector mesons with total spin 1 and odd parity arise, such as that: