QCD off the lightcone and the demise of the transverse momentum cut-off

Abstract

Criteria are given for the applicability of the asymptotic freedom of QCD. Perturbative QCD has a much broader range of utility than lightcone dominated phenomena. The most striking predictions pertain to transverse momenta that scale, i.e. grow proportionately to the large invariants. While hints of these unlimited transverse momenta are already visible in existing data, the predictions are unmistakable for μ-p, e+-e−, and hadron-hadron experiments now planned.

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