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# 9: Symmetries of the theory of strong interactions

The ﬁrst time people realized the key role of symmetries was in the plethora of particles discovered using the ﬁrst accelerators. Many of those were composite particle (to be explained later) bound by the strong interaction.

Thumbnail: Chromodynamic fields due to color charges, these are the neutral/"colorless" combinations. Image used with permission (Public Domain; Maschen).