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Angular distributions of muon pairs produced by 194 GeV/c negative pions

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Zeitschrift für Physik C Particles and Fields

Abstract

We present the angular distributions of muon pairs obtained in a high-statistics experiment using a 194-GeV/c π- impinging on a tungsten target. Our results are based on the analysis of 145,000 events with positive Feynmanx and mass above 4.07 GeV/c2, excluding the ϒ region. Simple first-order QCD relations allow us to determine the ratio of annihilation with hard-gluon emission to the sum of annihilation with hard-gluon emission and hard-gluon Compton scattering, which is found to be about 58% to 75%. We determine the parton square intrinsic transverse momenta to be of the order of 0.6 (GeV/c)2, and about 30% larger in the pion than in the nucleon. At largex 1, our data agree with the higher-twist hypothesis, and support the interpretation of the relevant scale parameter as the dimuon square transverse momentum.

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Author information

Author notes

  1. K. Freudenreich

    Present address: ETH, CH-8093, Zürich, Switzerland

  2. A. Ereditato

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

  3. S. Falciano

    Present address: INFN Sezione di Roma, Rome, Italy

  4. B. Betev

    Present address: Institute of Nuclear Research and Nuclear Energy, Sofia, Bulgaria

  5. E. Gorini

    Present address: Universität München, Garching, FRG

  6. P. Bordalo & J. Varela

    Present address: CFMC-INIC, Lisbon, Portugal

  7. J. J. Blaising, A. Degré, R. Morand & B. Mours

    Present address: LAPP, Annecy-le-Vieux, France

Authors and Affiliations

  1. ETH, CH-8093, Zürich, Switzerland

    S. Falciano, M. Guanziroli, H. Hofer, P. Lecomte, P. Le Coultre, H. Suter, V. L. Telegdi & G. Viertel

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

    B. Betev & K. Freudenreich

  3. Università di Napoli and INFN Sezione di Napoli, I-80125, Napoli, Italy

    A. Ereditato, E. Gorini & P. Strolin

  4. Ecole Polytechnique, F-91128, Palaiseau, France

    P. Bordalo, L. Cerrito, L. Kluberg, A. Romana, R. Salmeron & J. Varela

  5. CRN and Université Louis Pasteur, F-67037, Strasbourg, France

    J. J. Blaising, A. Degré, P. Juillot, R. Morand, B. Mours & M. Winter

Authors
  1. S. Falciano
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  2. M. Guanziroli
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  3. H. Hofer
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  4. P. Lecomte
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  5. P. Le Coultre
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  6. H. Suter
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  7. V. L. Telegdi
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  8. G. Viertel
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  9. B. Betev
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  10. K. Freudenreich
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  11. A. Ereditato
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  12. E. Gorini
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  14. P. Bordalo
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  15. L. Cerrito
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  19. J. Varela
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  20. J. J. Blaising
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NA10 Collaboration., Falciano, S., Guanziroli, M. et al. Angular distributions of muon pairs produced by 194 GeV/c negative pions. Z. Phys. C - Particles and Fields 31, 513–526 (1986). https://doi.org/10.1007/BF01551072

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  • DOI: https://doi.org/10.1007/BF01551072

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