Abstract
We find a significant excess of ultrahigh-energy cosmic-ray events at large transverse momenta with respect to the prediction by standard perturbative QCD at E(lab) approximately 10(4)-10(5) TeV, an energy regime beyond the reach of existing colliders but within the range of future hadron colliders. Such a large deviation cannot be accounted for by a compositeness model of quarks with a characteristic energy scale LAMBDA(c) > 1.4 TeV allowed by current collider experiments, pointing towards new physics.
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