The following webpage from SLAC listed all the leptons discovered up to date http://www2.slac.stanford.edu/vvc/theory/leptons.html. Although the strong color force dominates the hadrons era, the weak nuclear force dominates the leptons era.
The leptons era starts during the first 100-thousandth of a second after the big bang, with temperatures and densities lower than the previous hadrons era. The lower temperatures allow the nucleosynthesis of protons and neutrons as they waited for the arrivals of electrons in order to form perfect unions of happy wedded neutral atoms. However, some theories contended that these would not happen until the onset of the photon era. The irony is that none of these quarks waited longer than a second for the music to stop before choosing their associations. The 3-quark baryons and the 2-quark mesons bonds have all been preordained. There is no need of gluons acting as go-betweens or as wedding planners. Individual destiny is fulfilled because of the principle of space-time charge conservation.
The arrivals of negatively charged electrons initiated million years’ long engagement frenzies to the positively charged protons. However, the fatter indifference zero charged neutrons are left holding the empty lepton tea bags. Their sorrows prompted the creation of a space-time decree: that all free neutrons must decay within 15 minutes, to form protons, electrons, and virgin-birth neutrinos. Making these joyful events come true, the pi-mesons must change into the weak minded W+ and W-. But their laziness made then into fat and short-lived vector bosons. Still their legacy is the emergence of radioactivity marking the end of leptons dominion and forwarding the rise of the next photon era.
Nonetheless, a million years after, there are still a proportional numbers of neutron pairs that must be wedded to proton pairs, 4 massive Buddhas sharing two flea electrons forming a single helium atom. Astrophysical measurements indicate that the abundant ratio of monogamous hydrogen atoms to polygamous helium atoms is clearly three H(arems) to one He.


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