Quarks and Leptons

Quarks and Leptons :
After GUT matter forms, the next phase is for GUT matter to decay into lepton and quark matter. Lepton
matter will become our old friends the electron and neutrino (and their anti-particles). But quark matter is
unusual because of the property of quark confinement.
Quarks can never be found in isolation because the strong force becomes stronger with distance. Any
attempt to separate pairs or triplets of quarks requires large amounts of energy, which are used to produce
new groups of quarks.

With so much energy available in the early Universe, the endresult is a runaway production of quark and
anti-quark pairs. Trillions of times the amounts we currently see in the Universe. The resulting soup of
quark pairs will eventually suffer massive annihilation of its matter and anti-matter sides as soon as the
Universe expands and cools sufficiently for quark production to stop.
Notice that quark pairs are more stable than triplets, so that most of the quark production is done in pairs.
Later, pairs will interact to form triplets, which are called baryons.