1 Risø National Laboratory, Risø National Laboratory for Sustainable Energy, Technical University of Denmark2 Risø National Laboratory for Sustainable Energy, Technical University of Denmark3 Centre d'Etudes Nucléaires de Saclay4 CERN5 University of Perugia6 University of Heidelberg7 Universität Bern8 Università di Pisa9 Université de Paris-Sud10 Università di Pavia11 Niels Bohr Institute12 unknown13 CERN14 University of Perugia15 University of Heidelberg
The production of very large transverse momentum (pT) hadron jets has been measured in the UA2 experiment at the CERN pp Collider for s=630 GeV. The inclusive jet production cross sections exhibit a pT-dependent increase with respect to the s=546 GeV data from previous Collider runs. This increase can be described both by QCD calculations and by approximate xT=2pT/√s scaling. No significant deviation of the data from QCD predictions is observed at very large pT, placing a lower limit on the characteristic scale Λc of a hypothetical superstrong contact interaction responsible for the binding of preons in the quark (Λc>370 GeV at 95% CL).
Physics Letters. Section B: Nuclear, Elementary Particle and High-energy Physics, 1985, Vol 160, Issue 4-5, p. 349-356