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Experimental studies on multijet production ine + e − annihilation at PETRA energies

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Zeitschrift für Physik C Particles and Fields

Abstract

Hadronic jet production bye + e −-annihilation has been studied in the energy range of 14.0–46.7 GeV. The data have been analysed in terms of a cluster algorithm and other topological quantities. The results are compared with 2nd order QCD calculations which incorporate models for the fragmentation of quarks and gluons into hadrons. At the higher energies we observe more spherical and 4-jet like events than predicted by these calculations. We cannot achieve a simultaneous description of the observed 3- and 4-jet production by adjusting the strong coupling constant α s or the fragmentation parameters of the 2nd order QCD models. The observed excess of spherical events can partially be explained by the production of multi-parton events expected from higher order QCD contributions. Consequences of the presented results for the value of α s , determined in previous analyses, are discussed. QCD parton shower models, including soft gluon interference, are able to describe the observed number of spherical events.

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Author notes

  1. P. Laurikainen

    Present address: University of Helsinki, SF-00170, Helsinki, Finland

  2. N. Magnussen & D. Schmidt

    Present address: Universität-Gesamthochschule Wuppertal, D-5600, Wuppertal, FRG

  3. A. Petersen & S. Komamiya

    Present address: SLAC, California, USA

  4. S. R. Wagner

    Present address: University of Colorado, Boulder, CO, USA

Authors and Affiliations

  1. Deutsches Elektronen-Synchrotron DESY, D-2000, Hamburg, Federal Republic of Germany

    W. Bartel, L. Becker, R. Felst, D. Haidt, G. Knies, H. Krehbiel, P. Laurikainen, N. Magnussen, R. Meinke, B. Naroska, J. Olsson & D. Schmidt

  2. II. Institut für Experimentalphysik der Universität, D-2000, Hamburg, Federal Republic of Germany

    G. Dietrich, T. Greenshaw, J. Hagemann, G. Heinzelmann, H. Kado, C. Kleinwort, M. Kuhlen, A. Petersen, R. Ramcke, U. Schneekloth & G. Weber

  3. Physikalisches Institut der Universität, D-6900, Heidelberg, Federal Republic of Germany

    K. Ambrus, S. Bethke, A. Dieckmann, E. Elsen, J. Heintze, K. -H. Hellenbrand, S. Komamiya, J. von Krogh, H. Rieseberg, H. v. d. Schmitt, L. Smolik, J. Spitzer, A. Wagner & M. Zimmer

  4. University of Lancaster, LA1 4YB, Lancaster, UK

    C. K. Bowdery, A. J. Finch, F. Foster, G. Hughes & J. M. Nye

  5. University of Manchester, M13 9PL, Manchester, UK

    J. Allison, R. J. Barlow, J. Chrin, I. P. Duerdoth, F. K. Loebinger, A. A. Macbeth, H. E. Mills, P. G. Murphy, K. Stephens & P. Warming

  6. University of Maryland, 20742, College Park, MD, USA

    R. G. Glasser, P. Hill, J. A. J. Skard, S. R. Wagner & G. T. Zorn

  7. Rutherford Appleton Laboratory, Chilton, OX11 0QX, Didcot, UK

    S. L. Cartwright, D. Clarke, R. Marshall & R. P. Middleton

  8. International Center for Elementary Particle Physics, University of Tokyo, Tokyo, Japan

    K. Kawagoe, T. Mashimo, T. Takeshita & S. Yamada

Authors
  1. W. Bartel
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  2. L. Becker
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  3. R. Felst
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  4. D. Haidt
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  5. G. Knies
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  6. H. Krehbiel
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  7. P. Laurikainen
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  8. N. Magnussen
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  9. R. Meinke
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  10. B. Naroska
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  11. J. Olsson
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  12. D. Schmidt
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  13. G. Dietrich
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  14. T. Greenshaw
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  15. J. Hagemann
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  16. G. Heinzelmann
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  17. H. Kado
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  18. C. Kleinwort
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  19. M. Kuhlen
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  20. A. Petersen
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  21. R. Ramcke
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  22. U. Schneekloth
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  23. G. Weber
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  24. K. Ambrus
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  25. S. Bethke
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  26. A. Dieckmann
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  27. E. Elsen
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  28. J. Heintze
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  29. K. -H. Hellenbrand
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  30. S. Komamiya
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  31. J. von Krogh
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  32. H. Rieseberg
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  33. H. v. d. Schmitt
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  34. L. Smolik
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  35. J. Spitzer
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  36. A. Wagner
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  37. M. Zimmer
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  38. C. K. Bowdery
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  39. A. J. Finch
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  40. F. Foster
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  41. G. Hughes
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  42. J. M. Nye
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  43. J. Allison
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  44. R. J. Barlow
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  45. J. Chrin
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  46. I. P. Duerdoth
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  47. F. K. Loebinger
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  48. A. A. Macbeth
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  49. H. E. Mills
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  50. P. G. Murphy
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  51. K. Stephens
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  52. P. Warming
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  53. R. G. Glasser
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  54. P. Hill
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  55. J. A. J. Skard
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  56. S. R. Wagner
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  57. G. T. Zorn
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  58. S. L. Cartwright
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  59. D. Clarke
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  60. R. Marshall
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  61. R. P. Middleton
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  62. K. Kawagoe
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  63. T. Mashimo
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  64. T. Takeshita
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  65. S. Yamada
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JADE Collaboration., Bartel, W., Becker, L. et al. Experimental studies on multijet production ine + e − annihilation at PETRA energies. Z. Phys. C - Particles and Fields 33, 23–31 (1986). https://doi.org/10.1007/BF01410449

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  • DOI: https://doi.org/10.1007/BF01410449

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