Physics
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997phrvd..56.7361c&link_type=abstract
Physical Review D (Particles and Fields), Volume 56, Issue 11, 1 December 1997, pp.7361-7375
Physics
8
Cosmic-Ray Interactions, Experimental Tests, Composite Models
Scientific paper
We present a detailed account of our analysis on ultrahigh-energy cosmic-ray double-core γ-family events observed in emulsion chambers at mountain levels. Extending the leading-order perturbative QCD jet calculations for hadron-hadron collisions to hadron-nucleus collisions by including nuclear effects, we performed a Monte Carlo simulation of cosmic-ray particle interaction and propagation in the atmosphere. We find a significant excess of event rates at large transverse momenta with respect to our prediction based on perturbative QCD. The excess cannot be accounted for by a compositeness model of quarks with a characteristic energy scale lower limit Λc>1.4 TeV or a possible value of Λc~=1.6 TeV from the CDF at the Fermilab Tevatron. We discuss possible onset of new physics indicated by the large discrepancy at Elab~104-105 TeV, an energy region beyond the reach of existing colliders but within the range of future hadron colliders such as the proposed Large Hadron Collider at CERN.
Cao Zhoujian
Ding Lin-Kai
He Yu-Dong
Zhu Qianquan
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