[link to www.symmetrymagazine.org]
"The discovery of an elementary particle that
looked a lot like the electron, but had 3500 times
its mass stunned most particle physicists three
decades ago....Martin Perl received the
1995 NoBel Proze for finding the TAU on
a collaboration called 'MARk 1'
The particles he sought would
rapidly decay into three lighter particles:
a muon or an electron, a neutrino, and an antineutrino.
Other unstable and uninteresting particles
would result in only two of the lighter
particles so Perl had found a way to
distinguish his desired signal
from the background."

Work done at DESY-Hamburg, and
with the Direct Electron Counter (DELCO)
at SPEAR, subsequently established
the mass and spin of the Tau.