Chronology of Milestone Events in Particle Physics - BARTEL 1980D
Chronology of Milestone Events in Particle Physics

BARTEL 1980D

JADE collaboration; Bartel, W. et al.
Observation of Planar Three Jet Events in e+ e Annihilation and Evidence for Gluon Bremsstrahlung
Phys. Lett. 91B (1980) 142;

Abstracts
Topological distributions of charged and neutral hadrons from the reaction e+e- multihadrons are studied at 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- qg 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 qg-model we obtain a value for the strong coupling constant of s(q2) = 0.17 0.04.

Accelerator DESY-PETRA Detectors JADE

Related references
See also
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Reactions
  e+ e 2hadron (hadrons) 30 GeV (Ecm) ang
  e+ e (jets) 2jet 30 GeV (Ecm) ang
  e+ e q gluon
  q jet
  jet
  gluon jet

Particles studied
  gluon ex

Record comments
Confirmation of gluon jets.
    
  New Comments List of Comments