References:

Quantum Chromodynamics - Wikipedia

https://en.wikipedia.org/wiki/Quantum_chromodynamics

Strong CP (charge-parity) Problem - Wikipedia

https://en.wikipedia.org/wiki/Strong_CP_problem

Quark - Wikipedia

https://en.wikipedia.org/wiki/Quark

Origin of the Word “Quark” - ScienceFriday

https://www.sciencefriday.com/articles/the-origin-of-the-word-quark/

Eightfold Way (Physics) - Wikipedia

https://en.wikipedia.org/wiki/Eightfold_way_(physics)

Color Charge - Wikipedia

https://en.wikipedia.org/wiki/Color_charge

Non-Abelian Gauge Theory - Wikipedia

https://en.wikipedia.org/wiki/Non-abelian_gauge_theory

Lagrangian Function - Britannica

https://www.britannica.com/science/Lagrangian-function

Yang-Mills Theory - Wikipedia

https://en.wikipedia.org/wiki/Yang%E2%80%93Mills_theory

Special Unitary Triplet - Wikipedia

https://en.wikipedia.org/wiki/Special_unitary_group#The_group_SU(3)

Asymptotic Freedom - Wikipedia

https://en.wikipedia.org/wiki/Asymptotic_freedom

Color Confinement - Wikipedia

https://en.wikipedia.org/wiki/Color_confinement

Direct Photon Production - Wikipedia

https://en.wikipedia.org/wiki/Direct_photons

Jet (Physics) and Hadronization - Wikipedia

https://en.wikipedia.org/wiki/Jet_(particle_physics)

Peccei-Quinn Theory - Wikipedia

https://en.wikipedia.org/wiki/Peccei%E2%80%93Quinn_theory

Axion - Wikipedia

https://en.wikipedia.org/wiki/Axion