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Investigation of theW andQ 2 dependence of charged pion distributions inμ p scattering

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Zeitschrift für Physik C Particles and Fields

Abstract

TheW andQ 2 dependence of the fragmentation functions and of the average multiplicity of charged pions is investigated, using data from the NA9 experiment at the CERN SPS on muon-proton scattering at 280 GeV. A significant increase of pion production with increasingW is observed at fixedQ 2, leading to a rise of the average charged pion multiplicity, linear in lnW 2, and of the pion fragmentation function in the central region, i.e. at small |x F |. This increase can be understood from the kinematic widening of the cms rapidity range proportional to lnW 2 and the observedW independent height of the rapidity distribution. At fixedW, a rise of the average charged pion multiplicity withQ 2 is observed. This rise appears to be weaker than that observed for all charged hadrons implying a stronger rise withQ 2 for kaons and protons.

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Author notes

  1. K. Long & S. J. Wimpenny

    Present address: CERN, CH-1211, Geneva 23, Switzerland

  2. H. Brück

    Present address: DESY, D-2000, Hamburg, Federal Republic of Germany

  3. C. P. Bee & J. Coughlan

    Present address: Rutherford and Appleton Laboratory, Chilton, OX110 QX, Didcot, UK

  4. B. Badelek, J. Ciborowski, J. Gajewski & E. Rondio

    Present address: University of Warsaw, Poland

  5. A. Edwards

    Present address: JET, Joint Undertaking, Abingdon, UK

  6. G. Eszes, J. Figiel, E. Nagy, B. Pawlik, P. Ribarics & J. Toth

    Present address: Institute of Nuclear Physics, Krakow, Poland

  7. A. S. Johnson

    Present address: SLAC, Stanford, California, USA

  8. H. E. Montgomery

    Present address: FNAL, Batavia, Illinois, USA

  9. J. Nassalski

    Present address: Institute for Nuclear Studies, Warsaw, Poland

  10. M. Whalley

    Present address: University of Durham, UK

Authors and Affiliations

  1. III. Physikalisches Institut A, Physikzentrum, RWTH, D-5100, Aachen, Federal Republic of Germany

    G. Berghoff, M. Düren, F. J. Hasert, D. Lanske, M. Scheer, M. Scholz, K. Schultze & L. Urban

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

    J. Beaufays, G. Kellner, H. E. Montgomery & A. M. Osborne

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

    F. W. Brasse, W. Flauger, J. Gayler, V. Korbel & J. Nassalski

  4. Fakultät für Physik, Universität Freiburg, D-7800, Freiburg, Federal Republic of Germany

    T. Dreyer, T. Ernst, J. Haas, E. M. Kabuss, U. Landgraf, W. Mohr, K. Rith, A. Schlagböhmer, T. Schröder, H. E. Stier & W. Wallucks

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

    J. Ciborowski, J. Figiel, J. Gajewski, C. Hoppe, F. Janata, B. Pönsgen, E. Rondio, H. Schiemann, M. Studt & A. de la Torre

  6. Institut für Kernphysik, Universität Kiel, D-2300, Kiel, Federal Republic of Germany

    E. Böhm

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

    P. Heusse, M. Jaffré, A. Jacholkowska & C. Pascaud

  8. Department of Physics, University of Lancaster, LA1 4YB, Lancaster, UK

    C. P. Bee, I. Bird, D. Blum, J. Coughlan & T. Sloan

  9. LAPP, IN2P3, F-74019, Annecy-le-Vieux, France

    X. de Bouard, C. Broll, G. Coignet, G. Eszes, J. Favier, M. Maire, E. Nagy, H. Pessard, P. Ribarics, M. Schneegans, J. M. Thénard & J. Toth

  10. Oliver Lodge Laboratory, Department of Physics, University of Liverpool, L693BX, Liverpool, UK

    S. Brown, E. Gabathuler, R. Gamet, P. Hayman, J. Pettingale & S. J. Wimpenny

  11. Centre de Physique des Particules, Faculté des Sciences de Luminy, F-13288, Marseille, France

    J. J. Aubert, C. Benchouk, G. D'Agostini, F. Montanet, P. Payre & B. Pietrzyk

  12. Faculté des Sciences, Université de l'Etat à Mons, B-7000, Mons, Belgium

    F. Grard & R. Windmolders

  13. Max-Planck-Institut für Physik und Astrophysik, D-8000, München, Federal Republic of Germany

    F. Dengler, I. Derado, V. Eckardt, G. Jancso, P. Malecki, A. Manz, S. Maselli, B. Pawlik, N. Schmitz, M. Schouten & G. Wolf

  14. Nuclear Physics Laboratory, University of Oxford, OX13RH, Oxford, UK

    N. Geddes, A. S. Johnson, J. Loken, K. Long, P. Renton, G. N. Taylor & W. S. C. Williams

  15. Rutherford and Appleton Laboratory, Chilton, OX110 QX, Didcot, UK

    J. S. Chima, R. Clifft, P. R. Norton, F. G. Oakham & J. C. Thompson

  16. Department of Physics, University of Sheffield, S37RH, Sheffield, UK

    F. Combley, J. Foster, M. Whalley & S. Wheeler

  17. Istituto di Fisica, Università di Torino, I-10125, Torino, Italy

    M. Arneodo, M. I. Ferrero, P. Giubellino & C. Peroni

  18. Gustav Werners Institut, University of Uppsala, S-75121, Uppsala, Sweden

    A. Arvidson, B. Badelek, H. Calen, S. Dahlgren, P. Grafström, E. Hagberg & S. Kullander

  19. Fachbereich Physik, Universität Wuppertal, D-5600, Wuppertal, Federal Republic of Germany

    H. Braun, H. Brück, J. Drees, A. Edwards, J. Krüger & M. Pötsch

Authors
  1. M. Arneodo
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  2. A. Arvidson
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  3. J. J. Aubert
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  5. J. Beaufays
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  15. C. Broll
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  17. H. Brück
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  18. H. Calen
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  19. J. S. Chima
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European Muon Collaboration (EMC)., Arneodo, M., Arvidson, A. et al. Investigation of theW andQ 2 dependence of charged pion distributions inμ p scattering. Z. Phys. C - Particles and Fields 31, 1–12 (1986). https://doi.org/10.1007/BF01559586

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  • DOI: https://doi.org/10.1007/BF01559586

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