QCD

…Heavy-quark decoupling in QCD supplies a demonstration. Applying the approach to gravity yields a one-loop ultraviolet fixed point with indications of perturbative accessibility, which is compared with functional-renormalization-group evidence.

…Low-order simulations of QCD radiation carry large uncertainties, hadronization is commonly modeled rather than derived, and effective theories contain more operators than measurements can constrain. Information theory and machine learning can incorporate improved calculations into simulations, quantify uncertainty, choose informative observables and advance hadronization theory. Geometry of effective-theory field space combines infinite operator families into finite physical quantities,