Observation of planar three-jet events in e+e- annihilation and evidence for gluon bremsstrahlung

W. Bartel*, T. Canzler, D. Cords, P. Dittmann, R. Eichler, R. Felst, D. Haidt, S. Kawabata, H. Krehbiel, B. Naroska, L. H. O'Neill, J. Olsson, P. Steffen, W. L. Yen, E. Elsen, M. Helm, A. Petersen, P. Warming, G. Weber, H. DrummJ. Heintze, G. Heinzelmann, R. D. Heuer, J. von Krogh, P. Lennert, H. Matsumura, T. Nozaki, H. Rieseberg, A. Wagner, D. C. Darvill, F. Foster, G. Hughes, H. Wriedt, J. Allison, J. Armitage, I. Duerdoth, J. Hassard, F. Loebinger, B. King, A. Macbeth, H. Mills, P. G. Murphy, H. Prosper, K. Stephens, D. Clarke, M. C. Goddard, R. Hedgecock, R. Marshall, G. F. Pearce, M. Imori, T. Kobayashi, S. Komamiya, M. Koshiba, M. Minowa, S. Orito, A. Sato, T. Suda, H. Takeda, Y. Totsuka, Y. Watanabe, S. Yamada, C. Yanagisawa

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

163 Citations (Scopus)


Topological distributions of charged and neutral hadrons from the reaction e+e- → multihadrons are studied at √s of about 30 GeV. An excess of planar events is observed at a rate which cannot be explained by statistical fluctuations in the standard two-jet process. The planar events, mostly consisting of a slim jet on one side and a broader jet on the other, are shown actually to possess three-jet structure by demonstrating that the broader jet itself consists of two collinear jets in its own rest system. Detailed agreement between data and predictions is obtained if the process e+e-→q q ̄g is taken into account. This strongly suggests gluon bremsstrahlung as the origin of the planar three-jet events. By comparison of the data with the qq̄g-model we obtain a value for the strong coupling constant of αS(q2 = 0.17 ± 0.04.

Original languageEnglish
Pages (from-to)142-147
Number of pages6
JournalPhysics Letters B
Issue number1
Publication statusPublished - 1980 Mar 24
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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