Chronology of Milestone Events in Particle Physics - BARBER 1979F
Chronology of Milestone Events in Particle Physics

BARBER 1979F

Barber, D.P. et al.
Discovery of Three Jet Events and a Test of Quantum Chromodynamics at PETRA Energies
Phys. Rev. Lett. 43 (1979) 830;

Abstracts
We report the analysis of the spatial energy distribution of data for e+e- hadrons obtained with the MARK-J detector at PETRA. We define the quantity "oblateness'' to describe the flat shape of the energy configuration and the three-jet structure which is unambiguously observed for the first time. Our data can be explained by quantum chromodynamic predictions for the production of quark-antiquark pairs accompanied by hard noncollinear gluons.

Accelerator DESY-PETRA Detectors MARK-J

Related references
More (earlier) information appears in
D. P. Barber et al., Phys. Rev. Lett. 42 (1979) 1110;
See also
T. A. de Grand, Y. J. Ng, and S. H. H. Tye, Phys. Rev. D16 (1977) 3251;
G. Kramer et al., Phys. Lett. 79B (1978) 249;
J. Ellis, M. K. Gaillard, and G. C. Ross, Nucl. Phys. B111 (1976) 253;

Reactions
  e+ e 2hadron (hadrons) 27.4,30,31.6 GeV (Ecm) ang, col
  e+ e 3jet 27.4,30,31.6 GeV (Ecm) ang, cs, const
  e+ e q gluon 27.4,30,31.6 GeV (Ecm) ang, cs, const
  q jet
  jet
  gluon jet

Particles studied
  gluon ex

Record comments
First evidence for the gluon jet in e+ e 3jet annihilations.
    
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