Quark

:For other uses of this term, see: Quark (disambiguation)

Antiquarks

The additive quantum numbers of antiquarks are equal in magnitude and opposite in sign to those of the quarks. CPT symmetry forces them to have the same spin and mass as the corresponding antiquark. Tests of CPT symmetry cannot be performed directly on quarks and antiquarks, due to confinement, but can be performed on hadrons.

~ ~ ~ ~ ~ ~ ~ ~ ~ ~