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Jet production and fragmentation ine + e − annihilation at 12–43 GeV

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Zeitschrift für Physik C Particles and Fields

Abstract

We present the general properties of jets produced bye + e − annihilation. Their production and fragmentation characteristics have been studied with charged particles for c.m. energies between 12 and 43 GeV. In this energy rangee + e − annihilation into hadrons is dominated by pair production of the five quarksu, d, s, c andb. In addition, hard gluon bremsstrahlung effects which are invisible at low energies become prominent at the high energies. The observed multiplicity distributions deviate from a Poisson distribution. The multiplicity distributions for the overall event as well as for each event hemisphere satisfy KNO scaling to within ∼20%. The distributions ofx p=2p/W are presented; scale breaking is observed at the level of 25%. The quantityx p dδ/dx p is compared with multigluon emission calculations which predict a Gaussian distribution in terms of ln(1/x). The observed energy dependence of the maximum of the distributions is in qualitative agreement with the calculations. Particle production is analysed with respect to the jet axis and longitudinal and transverse momentum spectra are presented. The angular distribution of the jet axis strongly supports the idea of predominant spin 1/2 quark pair production. The particle distributions with respect to the event plane show clearly the growing importance of planar events with increasing c.m. energies. They also exclude the presence of heavy quark production,e + e −→Q \(\bar Q\) for quark masses up to 5<m Q <20.3 GeV (|e Q |=2/3) and 7<m Q <19 GeV (|e Q |=1/3). The comparison of 1/σtot dδ/dp T measured at 14, 22 and 34 GeV suggests that hard gluon bremsstrahlung contributes mainly to transverse momenta larger than 0.5 GeV/c. The rapidity distribution forW≧22 GeV shows an enhancement away fromy=0 which corresponds to an increase in yield of 10–15% compared to the centre region (y=0). The enhancement probably results from heavy quark production and gluon bremsstrahlung. The particle flux around the jet axis shows with increasing c.m. energy a rapidly growing number of particles collimated around the jet axis, while at large angles to the jet axis almost noW dependence is observed. For fixed longitudinal momentump ‖ approximate “fan invariance” is seen: The shape of the angular distribution around the jet axis is almost independent ofW. The collimation depends strongly onp ‖. For smallp ‖,p ‖<0.2 GeV/c, isotropy is observed. With increasingp ‖ the particles tend to be emitted closer and closer to the jet axis.

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Author notes

  1. J. Rimkus

    Present address: Siemens, München, FRG

  2. W. Hillen

    Present address: Philips, Aachen, FRG

  3. N. Wermes & G. Baranko

    Present address: SLAC, Stanford, CA, USA

  4. M. Wollstadt

    Present address: Lufthansa, Frankfurt, FRG

  5. Y. Eisenberg

    Present address: Weizmann Institute, Rehovot, Israel

  6. A. J. Campbell

    Present address: Glasgow University, Glasgow, UK

  7. W. A. T. Wan Abdullah

    Present address: Universiti Malaya, Kuala Lumpur

  8. R. J. Nowak

    Present address: Warsaw University, Warsaw, Poland

  9. D. R. Quarrie

    Present address: FNAL, Batavia, IL, USA

  10. Ch. Xiao

    Present address: University of Science and Technology of China, Hefei

  11. J. Proudfoot

    Present address: Argonne National Laboratory, Argone, IL, USA

  12. P. L. Woodworth

    Present address: Institute of Oceanographic Sciences, Bidston, Merseyside, UK

Authors and Affiliations

  1. I. Physikalisches Institut der RWTH, D-5100, Aachen, Federal Republic of Germany

    M. Althoff, W. Braunschweig, F. J. Kirschfink, K. Lübelsmeyer, H. -U. Martyn, G. Peise, J. Rimkus, P. Rosskamp, H. G. Sander, D. Schmitz, H. Siebke & W. Wallraff

  2. Physikalisches Institut der Universität, D-5300, Bonn, Federal Republic of Germany

    H. M. Fischer, H. Hartmann, W. Hillen, A. Joksch, G. Knop, L. Köpke, H. Kolanoski, H. Kück, V. Mertens, R. Wedemeyer, N. Wermes & M. Wollstadt

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

    Y. Eisenberg, K. Gather, H. Hultschig, P. Joos, W. Koch, U. Kötz, H. Kowalski, A. Ladage, B. Löhr, D. Lüke, P. Mattig, D. Notz, R. J. Nowak, J. Pyrlik, D. R. Quarrie, M. Rushton, W. Schütte, D. Trines, G. Wolf & Ch. Xiao

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

    R. Fohrmann, E. Hilger, T. Kracht, H. L. Krasemann, P. Leu, E. Lohrmann, D. Pandoulas, G. Poelz, K. U. Pösnecker & B. H. Wiik

  5. Department of Physics, Imperial College, SW7 2BZ, London, England

    R. Beuselinck, D. M. Binnie, A. J. Campbell, P. J. Dornan, B. Foster, D. A. Garbutt, C. Jenkins, T. D. Jones, W. G. Jones, J. McCardle, J. K. Sedgbeer, J. Thomas & W. A. T. Wan Abdullah

  6. Department of Nuclear Physics, University, OX1 3RH, Oxford, England

    K. W. Bell, M. G. Bowler, P. Bull, R. J. Cashmore, P. E. L. Clarke, R. Devenish, P. Grossmann, C. M. Hawkes, S. L. Lloyd, G. L. Salmon, T. R. Wyatt & C. Youngman

  7. Rutherford Appleton Laboratory, Chilton, OX1 0QX, Didcot, Oxon, England

    G. E. Forden, J. C. Hart, J. Harvey, D. K. Hasell, J. Proudfoot, D. H. Saxon & P. L. Woodworth

  8. Fachbereich Physik der Universität-Gesamthochschule, D-5900, Siegen, Federal Republic of Germany

    F. Barreiro, M. Dittmar, M. Holder & B. Neumann

  9. Department of Physics, University of Wisconsin, 53706, Madison, WI, USA

    G. Baranko, T. Barklow, A. Caldwell, M. Cherney, J. M. Izen, M. Mermikides, G. Rudolph, D. Strom, H. Venkataramania, E. Wicklund, Sau Lan Wu & G. Zobernig

  10. Weizmann Institute, Rehovot, Israel

    E. Duchovni, U. Karshon, G. Mikenberg, R. Mir, D. Revel, E. Ronat, A. Shapira & G. Yekutieli

Authors
  1. M. Althoff
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  2. W. Braunschweig
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  3. F. J. Kirschfink
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  4. K. Lübelsmeyer
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  5. H. -U. Martyn
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  6. G. Peise
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  7. J. Rimkus
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  9. H. G. Sander
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  12. W. Wallraff
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  13. H. M. Fischer
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  14. H. Hartmann
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  15. W. Hillen
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  16. A. Joksch
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  17. G. Knop
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  18. L. Köpke
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  19. H. Kolanoski
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  20. H. Kück
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  21. V. Mertens
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  26. K. Gather
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  28. P. Joos
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  29. W. Koch
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  37. R. J. Nowak
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  38. J. Pyrlik
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  39. D. R. Quarrie
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  40. M. Rushton
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  42. D. Trines
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  43. G. Wolf
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  51. D. Pandoulas
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  52. G. Poelz
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  53. K. U. Pösnecker
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  54. B. H. Wiik
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  58. P. J. Dornan
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  59. B. Foster
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  60. D. A. Garbutt
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  61. C. Jenkins
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  64. J. McCardle
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  65. J. K. Sedgbeer
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  66. J. Thomas
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  67. W. A. T. Wan Abdullah
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  70. P. Bull
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  71. R. J. Cashmore
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  72. P. E. L. Clarke
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  73. R. Devenish
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  77. G. L. Salmon
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  78. T. R. Wyatt
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  79. C. Youngman
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  80. G. E. Forden
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  81. J. C. Hart
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  82. J. Harvey
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  83. D. K. Hasell
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  84. J. Proudfoot
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  85. D. H. Saxon
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  86. P. L. Woodworth
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  87. F. Barreiro
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  88. M. Dittmar
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  89. M. Holder
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  90. B. Neumann
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  91. E. Duchovni
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  92. U. Karshon
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  93. G. Mikenberg
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  94. R. Mir
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  95. D. Revel
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  96. E. Ronat
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  97. A. Shapira
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  98. G. Yekutieli
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  99. G. Baranko
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  100. T. Barklow
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  101. A. Caldwell
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  102. M. Cherney
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  103. J. M. Izen
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  104. M. Mermikides
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  105. G. Rudolph
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  107. H. Venkataramania
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  108. E. Wicklund
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  109. Sau Lan Wu
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  110. G. Zobernig
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TASSO Collaboration

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Supported by the Konrad-Adenauer-Stiftung

Supported by the Deutsches Bundesministerium für Forschung und Technologie

Supported by the UK Science and Engineering Research Council

Supported by the Minerva Gesellschaft für Forschung mbH

Supported by the US Department of Energy contract DEAC02-76ER00881

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TASSO Collaboration., Althoff, M., Braunschweig, W. et al. Jet production and fragmentation ine + e − annihilation at 12–43 GeV. Z. Phys. C - Particles and Fields 22, 307–340 (1984). https://doi.org/10.1007/BF01547419

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  • DOI: https://doi.org/10.1007/BF01547419

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