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Criticality in quark-gluon systems far beyond thermal and chemical equilibrium.

Experimental evidence and theoretical arguments for the existence of self-organized criticality in systems of gluons and quarks are presented. It is observed that the existing data for high-transverse-momentum jet production exhibit striking regularities; and it is shown that such regularities can be used not only to probe the possible compositeness of quarks but also to obtain direct evidence for, or against, the existence of critical temperature and/or critical chemical potential in quark-gluon systems when hadrons are squeezed together.