Abstract
We argue that the observation of multiple cores in very-high-energy cosmic-ray collisions is expected in models where jet production becomes a feature of all interactions above ${10}^{4}$ TeV. The most striking feature of such events is the collinearity of cores in emulsion experiments. We argue that the observed alignment of three cores is a consequence of transverse-momentum conservation about the beam in a boosted two-jet event. We predict a certain degree of alignment in events with four cores which reflects a dynamical correlation in three-jet events given by QCD. Such correlations have already been observed in collider experiments. Additional four-core events must be observed in emulsion experiments before the alignment hypothesis is tested for cosmic-ray interactions.
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