Direct evidence for the emergence of jets in events triggered on large transverse energy in pp collisions at s = 63 GeV

T. Åkesson*, M. G. Albrow, S. Almehed, R. Batley, O. Benary, H. Bøggild, O. Botner, H. Brody, V. Burkert, A. Di Ciaccio, D. Cockerill, S. Dagan, E. Dahl-Jensen, I. Dahl-Jensen, G. Damgaard, W. M. Evans, C. W. Fabjan, P. Frandsen, S. Frankel, W. FratiH. Gordon, A. Hallgren, K. H. Hansen, B. Heck, H. J. Hilke, J. E. Hooper, G. Jarlskog, P. Jeffreys, T. Jensen, G. Kesseler, T. Killian, J. v.d. Lans, D. Lissauer, B. Lörstad, T. Ludlam, N. A. McCubbin, U. Mjörnmark, R. Møller, W. Molzon, B. S. Nielsen, A. Nilsson, L. H. Olsen, Y. Oren, L. Rosselet, E. Rosso, R. H. Schindler, B. Schistad, I. Stumer, E. Vella, W. J. Willis, M. Winik, W. Witzeling, C. Woody

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We present data obtained from a 1.7 sr hadron calorimeter, triggered on transverse energy, in pp collisions at s=63 GeV at the CERN-ISR. From the change in the distribution of energy in the calorimeter, we extract the cross section for two-constituent hard scattering for pT between 6 and 14 GeV at y = 0. The decrease of this jet cross section over this pT range is consistent with exp (-bpT), with b = (1.02 ± 0.09) GeV-1. The slope and normalization of the cross section agree well with a QCD motivated Monte Carlo model. The ratio between jet and single particle cross sections [dσJET/dpT)/(dσπ0/dpT)]| y = 0 changes from about 200 at 6 GeV to about 1500 at 14 GeV.

Original languageEnglish
Pages (from-to)185-192
Number of pages8
JournalPhysics Letters B
Volume118
Issue number1-3
DOIs
StatePublished - 2 Dec 1982

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