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A study of three-jet events at the CERN\(\bar pp\) collider

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Zeitschrift für Physik C Particles and Fields

Abstract

The UA2 experiment, running at the CERN SPS\(\bar pp\) Collider, has performed a study of events containing three hard jets in the final state. The angular distributions of the three jets show evidence for gluon bremsstrahlung, in good agreement with a QCD model to leading order in the strong coupling constant αs. The yield of three-jet events relative to that of two-jet events provides a measure of the strong coupling constant: ;3 K 3/K 2=0.23±0.01±0.04, whereK 2 andK 3 represent the contributions arising from higher order corrections in α3 to the two- and three-jet exclusive cross-sections. A detailed discussion of the systematic and theoretical uncertainties is given.

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Author information

Author notes

  1. P. Cenci

    Present address: Scuola Normale Superiore, Pisa, Italy

  2. R. Engelmann

    Present address: New York State University, Stony Brook, NY, USA

  3. T. Himel & A. F. Rothenberg

    Present address: SLAC, Stanford University, Stanford, USA

  4. S. N. Tovey (Visitor)

    Present address: University of Melbourne, Australia

  5. W. Y. Tsang

    Present address: Cavendish Laboratory, University of Cambridge, Cambridge, UK

Authors and Affiliations

  1. Laboratorium für Hochenergiephysik, Universität Bern, Sidlerstrasse 5, CH-3012, Bern, Switzerland

    K. Borer, B. Hahn, P. Mani, R. Moning, J. Schacher & F. Stocker

  2. CERN, CH-1211, Geneva 23, Switzerland

    P. Bagnaia, M. Borghini, J. Bürger, A. G. Clark, P. Darriulat, L. Di Lella, K. Einsweiler, R. Engelmann, O. Gildemeister, C. Gössling, H. Hänni, J. R. Hansen, P. Hansen, N. Harnew, T. Himel, P. Jenni, L. Mapelli, K. Meier, C. Onions, M. A. Parker, A. F. Rothenberg, M. Swartz, S. N. Tovey (Visitor) & A. R. Weidberg

  3. Niels Bohr Institute, Blegdamsvej 17, DK-2100, Copenhagen, Denmark

    J. Dines-Hansen, P. Hansen, O. Kofoed-Hansen, B. Madsen & R. Mollerud

  4. Institut für Hochenergiephysik der Universität Heidelberg, Schröderstrasse 90, D-6900, Heidelberg, Federal Republic of Germany

    K. Bernlöhr, K. Jakobs, E. E. Kluge, H. Plothow-Besch, M. Schlötelburg & M. Wunsch

  5. Laboratoire de l'Accélérateur Linéaire, Université de Paris-Sud, F-91405, Orsay, France

    J. -C. Chollet, B. De Lotto, L. Fayard, D. Froidevaux, J. -M. Gaillard, L. Iconomidou-Fayard, B. Merkel, M. Moniez, G. Parrour, J. -P. Repellin & G. Sauvage

  6. Dipartimento di Fisica Nucleare e Teorica, Università di Pavia and INFN, Via Bassi 6, I-27100, Pavia, Italy

    C. Conta, M. Fraternali, V. G. Goggi, M. Livan, F. Pastore, A. Rimoldi & V. Vercesi

  7. Gruppo INFN del Dipartimento di Fisica dell'Università di Perugia, I-06100, Perugia, Italy

    R. Battiston, P. Cenci, A. Codino, G. C. Mantovani & M. Pepe

  8. Sezione di Pisa, Dipartimento di Fisica dell'Università di Pisa and INFN, Via Livornese, S. Piero a Grado, I-56100, Pisa, Italy

    G. Carboni, V. Cavasinni, T. Del Prete, M. Morganti & M. Valdata-Nappi

  9. Centre d'Etudes Nucléaires de Saclay, F-91191, Gif-sur-Yvette, France

    J. A. Appel, M. Banner, E. Lançon, S. Loucatos, B. Mansoulié, M. Polverel, A. Roussarie, V. Ruhlmann, J. Teiger & H. Zaccone

Authors
  1. J. A. Appel
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  2. P. Bagnaia
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  3. M. Banner
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  4. R. Battiston
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  5. K. Bernlöhr
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  6. K. Borer
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  7. M. Borghini
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  8. J. Bürger
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  9. G. Carboni
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  10. V. Cavasinni
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  11. P. Cenci
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  12. J. -C. Chollet
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  13. A. G. Clark
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  14. A. Codino
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  15. C. Conta
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  16. P. Darriulat
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  17. B. De Lotto
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  18. T. Del Prete
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  19. L. Di Lella
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  20. J. Dines-Hansen
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  21. K. Einsweiler
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  22. R. Engelmann
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  23. L. Fayard
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  24. M. Fraternali
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  25. D. Froidevaux
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  26. J. -M. Gaillard
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  27. O. Gildemeister
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  28. V. G. Goggi
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  29. C. Gössling
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  30. B. Hahn
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  31. H. Hänni
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  32. J. R. Hansen
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  33. P. Hansen
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  34. N. Harnew
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  35. T. Himel
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  36. L. Iconomidou-Fayard
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  37. K. Jakobs
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  38. P. Jenni
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  39. E. E. Kluge
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  40. O. Kofoed-Hansen
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  41. E. Lançon
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  42. M. Livan
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  43. S. Loucatos
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  44. B. Madsen
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  45. P. Mani
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  46. B. Mansoulié
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  47. G. C. Mantovani
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  48. L. Mapelli
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  49. K. Meier
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  50. B. Merkel
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  51. R. Mollerud
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  52. M. Moniez
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  53. R. Moning
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  54. M. Morganti
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  55. C. Onions
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  56. M. A. Parker
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  57. G. Parrour
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  58. F. Pastore
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  59. M. Pepe
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  60. H. Plothow-Besch
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  61. M. Polverel
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  62. J. -P. Repellin
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  63. A. Rimoldi
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  64. A. F. Rothenberg
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  65. A. Roussarie
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  66. V. Ruhlmann
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  67. G. Sauvage
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  68. J. Schacher
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  69. M. Schlötelburg
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  70. F. Stocker
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  71. M. Swartz
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  72. J. Teiger
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  73. S. N. Tovey
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  74. W. Y. Tsang
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  75. M. Valdata-Nappi
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  76. V. Vercesi
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  77. A. R. Weidberg
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  78. M. Wunsch
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  79. H. Zaccone
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Consortia

The UA2 Collaboration

Additional information

On leave from FNAL, Batavia, USA.

On leave from DESY, Hamburg, FRG.

On leave from INFN, Pavia, Italy.

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The UA2 Collaboration., Appel, J.A., Bagnaia, P. et al. A study of three-jet events at the CERN\(\bar pp\) collider. Z. Phys. C - Particles and Fields 30, 341–353 (1986). https://doi.org/10.1007/BF01557598

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  • DOI: https://doi.org/10.1007/BF01557598

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