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Charged particle multiplicity distributions at 200 and 900 GeV c.m. energy

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Zeitschrift für Physik C Particles and Fields

Abstract

Multiplicity distributions of charged particles produced in non single-diffractive collisions between protons and antiprotons at centre of mass energies of 200 and 900 GeV are presented. The data were recorded in the UA5 streamer chambers at the CERN Collider, which was operated in a pulsed mode between the two energies. A new method to correct for acceptance limitations and inefficiencies based on the principle of maximum entropy has been used. Multiplicity distributions in full phase space and in intervals of pseudorapidity are presented in tabular form. The violation of KNO scaling in full phase space found by the UA5 group at an energy of 546 GeV is confirmed also at 200 and 900 GeV. The shape of the 900 GeV distribution in full phase space is narrower in the peak region than at 200 GeV but exhibits a pronounced high multiplicity tail. The negative binomial distribution fits data at 200 GeV in all pseudorapidity intervals and in small intervals at 900 GeV. In large intervals at 900 GeV, however, the negative binomial distribution. Fits to the partially coherent laser distribution are also presented as well as comparisons with predictions of the Dual Parton, the Fritiof and the Pythia models.

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Author information

Author notes

  1. P. Carlson

    Present address: the Manne Siegbahn Institute, S-10405, Stockholm, Sweden

  2. I. Evangelou, N. Manthos & F. Triantis

    Present address: the University of Ioannina, Greece

  3. J. Gaudaen

    Present address: the Universitaire Instellingen Antwerpen, Antwerp, Belgium

Authors and Affiliations

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

    L. Burow, B. Eckart, C. Geich-Gimbel, B. Holl & W. Pelzer

  2. Inter-University Institute for High Energies (ULB-VUB), B-1050, Brussels, Belgium

    J. Gaudaen, L. Van Hamme & G. Wilquet

  3. Cavendish Laboratory, Department of Physics, Cambridge University, CB3 0HE, Cambridge, UK

    R. E. Ansorge, R. S. DeWolf, D. J. Munday, J. G. Rushbrooke, C. P. Ward, D. R. Ward, C. J. S. Webber & T. O. White

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

    I. Evangelou, C. Fuglesang, N. Manthos & F. Triantis

  5. Institute of Physics, University of Stockholm, S-11346, Stockholm, Sweden

    B. Åsman, P. Carlson, G. Ekspong, C. Fuglesang, K. Jon-And, F. Lotse, C. Walck & N. Yamdagni

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  1. R. E. Ansorge
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  2. B. Åsman
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  8. I. Evangelou
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  9. C. Fuglesang
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  11. C. Geich-Gimbel
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UA 5 Collaboration., Ansorge, R.E., Åsman, B. et al. Charged particle multiplicity distributions at 200 and 900 GeV c.m. energy. Z. Phys. C - Particles and Fields 43, 357–374 (1989). https://doi.org/10.1007/BF01506531

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  • DOI: https://doi.org/10.1007/BF01506531

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