Three-jet production in pp collisions at {Mathematical expression} and a determination of αs

T. Åkesson*, M. G. Albrow, S. Almehed, R. Batley, O. Benary, H. Bøggild, O. Botner, H. Breuker, B. Callen, A. A. Carter, J. R. Carter, P. Cecil, Y. Choi, W. E. Cleland, S. Dagan, E. Dahl-Jensen, I. Dahl-Jensen, G. Damgaard, C. W. Fabjan, S. FrankelW. Frati, U. Goerlach, H. Gordon, K. H. Hansen, V. Hedberg, G. Jarlskog, S. Katsanevas, R. Kroeger, K. Kulka, D. Lissauer, B. Lörstad, A. Markou, N. A. McCubbin, U. Mjörnmark, R. Møller, W. Molzon, B. S. Nielsen, L. Olsen, Y. Oren, L. Rosselet, J. Schukraft, H. Specht, I. Stumer, M. Sullivan, H. H. Thodberg, J. A. Thompson, E. Vella, J. Williamson, W. J. Willis, C. Woody, W. A. Zajc

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We have studied pp collisions at the CERN ISR at {Mathematical expression} using a jet trigger. We demonstrate that a sample of well-separated triple high-pT jet events can be described as due to the QCD bremsstrahlung process. The energy flow of these 3-jet events is well described by an independent fragmentation model, with a gluon-jet transverse width 33% greater than the quark-jet width. From the ratio of the 3- and 2-jet production crosssections the strong coupling is determined to lowest order in QCD. We find αs=0.18±0.03 (stat.) ±0.04 (stst.). The error does not include the theoretical uncertainty in the fragmentation scheme. We compare our results with measurements at the SPS Collider and discuss the different methods used.

Original languageEnglish
Pages (from-to)317-334
Number of pages18
JournalEuropean Physical Journal C
Issue number3
StatePublished - Sep 1986


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