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Measurement and analysis of the reactionγγ→π + π − π + π −

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Zeitschrift für Physik C Particles and Fields

Abstract

We have measured the cross section of four charged pion production in photon-photon interactions in the invariant mass range 1.0≦W γγ≦3.2 GeV and up toQ 2=16 GeV2. For 1.2 GeV≦W γγ≦1.7 GeV the process is dominated by ρ0ρ0 production with a rapid rise in cross section around 1.2 GeV, well below the nominal ρ0ρ0 threshold. The observed distributions in the two particle masses and in the production and decay angles are well described by an incoherent sum of the phase-space subprocesses γγ →ρ0ρ0, →ρ0π+π−, and →π+π−π+π−. A spin-parity analysis of the ρ0ρ0 system showsJ P=2+ to dominate, although 0+ is also possible forW γγ≦1.4 GeV. Negative partity states are excluded.

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Author information

Author notes

  1. H. Kapitza

    Present address: University of Maryland, 20742, College Park, MD, USA

  2. W. Wagner

    Present address: University of California at Davis, 95616, Davis, CA, USA

  3. B. Lewendel

    Present address: Institut für Experimentalphysik der Universität Hamburg, D-2000, Hamburg, FRG

  4. M. Zachara

    Present address: Institute of Nuclear Physics, PL-30059, Cracow, Poland

  5. S. L. Cartwright

    Present address: SLAC, Stanford, USA

  6. J. B. Daniton, B. T. King & S. J. Maxfield

    Present address: University of Liverpool, L69 3BX, Liverpool, UK

  7. A. J. Tylka

    Present address: Carleton University, Ottawa, Ontario, Canada K1S 5B6

  8. M. Krüger

    Present address: Universität Karlsruhe, D-7500, Karlsruhe, FRG

  9. M. Poppe

    Present address: CERN-EP, Switzerland

  10. G. E. Welch

    Present address: Texas Accelerator Center, 2319 Timberland Place, 77380, The Woodlands, TX, USA

  11. F. Almeida

    Present address: Instituto di Fisica, Universidad Federal do Rio de Janeiro, Ilha do Fundao, Rio de Janeiro, RJ, Brazil

  12. F. Barreiro

    Present address: Canto Blanco, Universidad Autonoma de Madrid, Madrid 34, Spain

  13. K. Derikum

    Present address: BESSY, D-1000, Berlin

Authors and Affiliations

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

    Ch. Berger, H. Genzel, W. Lackas, J. Pielorz, F. Raupach & W. Wagner

  2. University of Bergen, N-5014, Bergen, Norway

    A. Klovning & E. Lillestöl

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

    J. Bürger, L. Criegee, A. Deuter, F. Ferrarotto, G. Franke, M. Gaspero, Ch. Gerke, G. Knies, B. Lewendel, J. Meyer, U. Michelsen, K. H. Pape, B. Stella, U. Timm, G. G. Winter, M. Zachara & W. Zimmermann

  4. University of Glasgow, G12 8QQ, Glasgow, UK

    P. J. Bussey, S. L. Cartwright, J. B. Daniton, D. Hendry, B. T. King, C. Raine, J. M. Scarr, I. O. Skillicorn, K. M. Smith & J. C. Thomson

  5. II. Institut für Experimentalphysik der Universität Hamburg, D-2000, Hamburg, Germany

    O. Achterberg, V. Blobel, D. Burkart, K. Diehlmann, M. Feindt, H. Kapitza, B. Koppitz, M. Krüger, M. Poppe, H. Spitzer & R. van Staa

  6. Universität-Gesamthochschule Siegen, D-5900, Siegen, Germany

    F. Almeida, A. Bäcker, F. Barreiro, S. Brandt, K. Derikum, C. Grupen, H. J. Meyer, H. Müller, B. Neumann, M. Rost, K. Stupperich & G. Zech

  7. Tel-Aviv University, 699 78, Tel-Aviv, Ramat Aviv, Israel

    G. Alexander, G. Bella, Y. Gnat & J. Grunhaus

  8. Universität-Gesamthochschule Wuppertal, D-5600, Wuppertal, Germany

    H. Junge, K. Kraski, C. Maxeiner, H. Maxeiner, H. Meyer & D. Schmidt

  9. Cosmic Ray Astrophysics Branch, Code 4154.8

    C. Y. Chang, R. G. Glasser, R. G. Kellogg, S. J. Maxfield, R. O. Polvado, B. Sechi-Zorn, J. A. Skard, A. Skuja, A. J. Tylka, G. E. Welch & G. T. Zorn

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  1. Ch. Berger
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  2. H. Genzel
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  7. A. Klovning
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  9. J. Bürger
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  30. B. T. King
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  38. D. Burkart
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  39. K. Diehlmann
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PLUTO Collaboration

Additional information

Deceased

Supported by the BMFT, FRG

Partially supported by the Norwegian Council for Science and the Humanities.

Rome University, partially supported by I.N.F.N., Sezione di Roma, I-00135 Rome, Italy

Supported by the UK. Science and Engineering Research Council

Partially supported by the Department of Energy, USA

Partially supported by the Israeli Academy of Sciences and Humanities, Basic Research Foundation

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PLUTO Collaboration., Berger, C., Genzel, H. et al. Measurement and analysis of the reactionγγ→π + π − π + π − . Z. Phys. C - Particles and Fields 38, 521–533 (1988). https://doi.org/10.1007/BF01624356

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