Three-jet events at the CERN intersecting storage rings

A. L.S. Angelis, G. Basini, H. J. Besch, R. E. Breedon, L. Camilleri, T. J. Chapin, R. L. Cool, P. T. Cox, C. Von Gagern, C. Grosso-Pilcher, D. S. Hanna, B. M. Humphries, J. T. Linnemann, C. Newman-Holmes, R. B. Nickerson, N. Phinney, B. G. Pope, S. H. Pordes, K. J. Powell, R. W. RusackC. W. Salgado, A. M. Segar, S. R. Stampke, M. J. Tannenbaum, J. M. Yelton

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


Three-jet events have been observed in pp collisions at s = 62.3 GeV. The data were collected using a total neutral energy trigger with a threshold at 25 GeV. These events appear predominantly as two jets, with some appearing as three jets. A novel analysis for the extraction of 2-jet and 3-jet events is described, and some of the event properties are discussed. The relative numbers of two- and three-jet events are studied within the framework of leading-order QCD, and yield a value of αs(K3/K2) = 0.19 ± 0.02 (stat.) ± 0.04 (syst.).

Original languageEnglish (US)
Pages (from-to)569-606
Number of pages38
JournalNuclear Physics, Section B
Issue number4
StatePublished - Jul 11 1988


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