Discovery of Three-Jet Events and a Test of Quantum Chromodynamics at PETRA

  title={Discovery of Three-Jet Events and a Test of Quantum Chromodynamics at PETRA},
  author={Desmond P. Barber and Ulrich J. Becker and H. Benda and A. Boehm and J. G. Branson and Jan Bron and D. Buikman and J. D. Burger and C.-C. Chang and H. S. Chen and Min Chen and Cp Cheng and Yanyun Chu and Robert Clare and Peter N. Duinker and G. Y. Fang and H. Fesefeldt and D. G. Fong and Mitsuhiro Fukushima and J. Guo and Ali Hariri and Gregor Herten and Meng Chit Ho and H. K. Hsu and T. T. Hsu and R. W. Kadel and Wulf Dieter Krenz and J. Li and Q. Z. Li and M. Lu and Nicolas Produit and Da-an Ma and C. M. Ma and Giovanni Massaro and Tatsuro Matsuda and Harvey B. Newman and Joseph A. Paradiso and F. P. Poschmann and J-P. Revol and Manfred Rohde and Hans Rykaczewski and Klaus Sinram and H. W. Tang and L. G. Tang and Samuel C. C. Ting and K. L. Tung and François Vannucci and X. R. Wang and P. S. P. Wei and Martin White and G. H. Wu and T. W. Wu and J. P. Xi and P. C. Yang and X. H. Yu and N. L. Zhang and R. Y. Zhu},
  journal={Physical Review Letters},
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. In previous papers' we have reported the observation… 

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Massachusetts Institute of Technology

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1 shows three distinct jet structures. We wish to thank Professor H

  • 1 shows three distinct jet structures. We wish to thank Professor H

Nucl. Phys. Phys. Rev. D Phys. Lett. Nucl. Phys. B138

  • Nucl. Phys. Phys. Rev. D Phys. Lett. Nucl. Phys. B138
  • 1976

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  • Phys. Rev. Lett. Phys. Rev. Lett
  • 1979

Sohngen for their valuable advice and support and Dr. A. Ali and Professor H. Georgi for helpful discussions

  • We also thank Miss I. Schulz, Miss S. Marks, Mrs. S. Burger, Mr. P. Berges, and Mr. D. Osborne for technical and administrative help