Lighters and heaviers

After the discovery of meson (m ) i.e. "intermedier" , heavier 207* times than electron, but much more lighter than proton, it was decided to name light particles as leptons or lighters.

Leptons can be found in Greece - you can take one of them as a souvenir**.

Lepto(n)

It's a bit unlucky but third lighter - tau (t), is twice heavier than proton, neutron and many others heaviers or hadrons.

Do not try to lift up  t lepton, you will squeeze your fingers!

* Lepton's masses (1990)

• m_e=0,51099906±0.000000015 MeV, lifetime > 2·10 ²² years

• m_m=105,658387±0.000034 MeV, lifetime (2,19703±0,00004)·10^-6 s

• m_t=1784,1^+2.7 _-3.6 MeV, lifetime (0,303±0.008)·10-12 s

** Organizers appology, but Bank of Greece retracts 1 lepto coins from currency and it was not possible to deliver a sufficient amount of leptons.
Masses of  presented here  m lepton, proton and neutron corresponds exactly to the proportions to 1 cent lepton e (2.29g). t.
"Lepton" in the present shape is slighty heavier than it should be from comparison to e lepton.