[link to en.wikipedia.org]
The Tau is the only lepton that can decay into hadrons—the other leptons do not have the necessary mass. Like the other decay modes of the tau, the hadronic decay is through the weak interaction. (Riazuddin, NCP 5th Particle Physics Sypnoisis Islamabad,: Riazuddin, Head of High-Energy Theory Group at National Center for Physics)

Two types of Hadrons-
Baryons/Hyperons
and
Mesons /Quarkonia
[link to en.wikipedia.org]

Why PI is Wrong~~~~No REally its Tau~~
[link to tauday.com]

There are 13 MESS-ONs
which are unstable subatomic
particles composed of one quark
and one antiquark
beginning with
PIONs designated by the
Pi symbol.... has
zero spin and is made
of first generation quarks.
~~~ZERO SPIN---PI can not
be A Turn of a Circle,
A REVOLUTION~~~~ Pi is
'piece of' and does not take
the whole into consideration
which is in the form of an Arc
measured by two intersecting
lines forming a base form of Tau.


The 13th Meson is the T Meson~~~~
SCientists do not expect
to find it in nature, but
hypothetically it would
be composed of a Top Quark
and either an up-to
Down(T+)(T-), Strange(T+)(T-),
or Charm Antiquark(T0)(T0)

The last Meson discovered (Meson D) was
in 1976 by the MarK I detector at the
Stanford Linear Accelerator Center

The TAU Particle also called
the Tau Lepton, or Tau-on~~~~
Like all elementary particles,
the tau has a corresponding antiparticle
of opposite charge but equal mass and spin:
The Anti-Tau (also called the Positive Tau)
[link to en.wikipedia.org]

The Tau Neutrino or Tauon neutrino
is a subatomic elementary particle
which has the symbol Vt
and no net electric charge.
The discovery of the Tau neutrino
was announced in July 2000
by the DONUT Collaboration.
which stands for
Direct Observation of the Nu Tau E872 '
from Fermilab...Batavia twp,
KANE County, Illinois, near Chicago,
is a US Department of Energy national laboratory specializing in high-energy particle physics.

As of January 1, 2007, Fermilab is
operated by the Fermi Research Alliance,
a joint venture of the University of Chicago, Illinois Institute of Technology and the Universities Research Association (URA)
[link to www.ura-hq.org]

"Universities Research Association (URA)
is a consortium of 86 leading
research oriented universities
with members primarily in the
United States, and also in
Canada, Japan, and Italy.

At the behest of President Lyndon Johnson’s
Science Advisory Committee and the National Academy of Sciences, the not-for-profit URA corporation was founded in 1965 for management and operation of research facilities in the national interest".

"URA’s charter is “...
to acquire, plan, construct,
and operate machines, laboratories,
and other facilities, under contract
with the Government of the United States
or otherwise, for research, development
and education in the physical and
biological sciences... and to educate
and train technical, research and
student personnel in said sciences.”