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Higher order QCD effects and particle density in full phase space from highp T interactions at the ISR

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Zeitschrift für Physik C Particles and Fields

Abstract

A comparison of QCD parton models with events including a high transverse momentum trigger particle is performed. The data were obtained with the Split Field Magnet (SFM) detector at the CERN ISR. The effective intrinsic transverse momentum, 〈k T 〉, of a parton is found to be about 1 GeV/c from an analysis of inclusive cross sections based upon lowest order parton-parton scattering. Large values of 〈k T 〉 are also needed to obtain a good description of the particle density in the azimuthal hemisphere opposite to the trigger. The measured recoil of the spectator jets tends to require much smaller values of 〈k T 〉. The model is improved by including higher-order QCD effects. Thus, starting from 〈k T 〉=0.45 GeV/c, an effective 〈k T 〉 of about 1 GeV/c at hard scattering is generated through perturbative parton showers, which provides a consistent description of the measurements in full phase space. This analysis shows therefore that well-known problems of lowest-order QCD calculations can be resolved by inclusion of higher-order effects.

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Author notes

  1. C. D. Buchanan

    Present address: Department of Physics, UCLA, Los Angeles, USA

  2. A. Breakstone

    Present address: University of Hawaii, USA

  3. H. Frehse

    Present address: CONVEX, Zürich, Switzerland

  4. W. M. Geist

    Present address: CRN, Strasbourg, France

  5. M. Heiden

    Present address: DEC, Kaufbeuren, Germany

  6. D. Isenhower

    Present address: Abilene Christian College, Abilene, Texas, USA

  7. T. Nakada

    Present address: Paul Scherrer Institute, Villigen, Switzerland

  8. M. Schmelling

    Present address: University of Mainz, Germany

  9. R. Yeung

    Present address: Cal. Tech., Pasadena, USA

Authors and Affiliations

  1. Ames Laboratory and Physics Department, Iowa State University, 50010, Ames, IA, USA

    A. Breakstone, H. B. Crawley, A. Firestone, M. Gorbics, D. Isenhower, J. W. Lamsa, W. T. Meyer & J. Skeens

  2. Dipartimento di Fisica dell'Università, INFN, I-40126, Bologna, Italy

    R. Campanini, M. Cuffiani, M. M. Deninno, F. Fabbri, G. Giacomelli, F. Rimondi & G. P. Siroli

  3. European Organization for Nuclear Research, CERN, CH-1211, Geneva, Switzerland

    C. D. Buchanan, G. M. Dallavalle, D. Drijard, H. G. Fischer, H. Frehse, W. M. Geist, M. Gorski, M. Heiden, T. Lohse, O. Ullaland & R. Yeung

  4. Institut für Physik der Universität Dortmund, W-4600, Dortmund, Germany

    R. Mankel, K. Rauschnabel, M. Schmelling & D. Wegener

  5. Institut für Hochenergiephysik der Universität Heidelberg, W-6900, Heidelberg, Germany

    H. Flöge, L. Gesswein, P. Hanke, E. E. Kluge, T. Nakada, M. Panter, A. Putzer & B. Rensch

  6. University and Institute for Nuclear Studies, PL-00681, Warsaw, Poland

    K. Doroba, R. Gokieli, R. Sosnowski & M. Szczekowski

Authors
  1. A. Breakstone
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  2. C. D. Buchanan
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  3. R. Campanini
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  4. H. B. Crawley
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  5. M. Cuffiani
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  6. G. M. Dallavalle
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  7. M. M. Deninno
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  8. K. Doroba
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  9. D. Drijard
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  10. F. Fabbri
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  11. A. Firestone
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  12. H. G. Fischer
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  15. W. M. Geist
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  16. L. Gesswein
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  17. G. Giacomelli
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  18. R. Gokieli
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  19. M. Gorbics
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  20. M. Gorski
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  21. P. Hanke
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  22. M. Heiden
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  23. D. Isenhower
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  24. E. E. Kluge
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  25. J. W. Lamsa
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  26. T. Lohse
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  27. R. Mankel
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  28. W. T. Meyer
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  29. T. Nakada
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  30. M. Panter
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  31. A. Putzer
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  32. K. Rauschnabel
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  33. B. Rensch
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  34. F. Rimondi
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  35. M. Schmelling
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  36. G. P. Siroli
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  37. J. Skeens
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  38. R. Sosnowski
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  39. M. Szczekowski
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  40. O. Ullaland
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  41. D. Wegener
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  42. R. Yeung
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Ames-Collaboration

Bologna-Collaboration

CERN Collaboration

Dortmund Collaboration

Heidelberg Collaboration

Warsaw Collaboration

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Ames-Collaboration., Bologna-Collaboration., CERN Collaboration. et al. Higher order QCD effects and particle density in full phase space from highp T interactions at the ISR. Z. Phys. C - Particles and Fields 52, 551–557 (1991). https://doi.org/10.1007/BF01562327

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  • DOI: https://doi.org/10.1007/BF01562327

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