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Measurement of the two-photon reactionγγ →π + π − π + π − at large values ofQ 2

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Zeitschrift für Physik C Particles and Fields

Abstract

The process γγ→π+π−π+π− has been investigated in reactions of the typee + e −→e + e −π+π−π+π− in the single tag mode. The range of the four momentum squared of one of the virtual photons was 0.28 GeV2/c2≦Q 2≦3.6 GeV2/c2, the average being 〈Q 2〉=0.92 GeV2/c2; the other photon was quasi real. The reaction is mainly described by the channels γγ→ρ0ρ0 and γγ→4π (phase space), occuring with about equal probability. TheQ 2-dependence of the cross section is in agreement with the ρ form factor.

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Author information

Author notes

  1. T. Kracht

    Present address: Deutsches Electronen-Synchrotron DESY, Hamburg, Federal Republic of Germany

  2. F. Barreiro (Alexander von Humboldt Fellow)

    Present address: Universidad Autonoma de Madrid, Madrid, Spain

  3. D. Su

    Present address: Rutherford Appleton Laboratory, Chilton, Didcot, UK

  4. B. Bock

    Present address: Krupp Atlas Elektr. GmbH, Bremen, FRG

  5. E. Bernardi

    Present address: Robert Bosch GmbH, Schwieberdingen, FRG

  6. J. Chwastowski & A. Eskreys

    Present address: Inst. of Nuclear Physics, Cracow, Poland

  7. K. Genser, J. M. Pawlak & R. Walczak

    Present address: Warsaw University, Poland

  8. P. Mättig

    Present address: Carleton University, IPP Canada, Ottawa, Canada

  9. G. E. Forden, J. C. Hart & D. H. Saxon

    Present address: SUNY Stony Brook, Stony Brook, NY, USA

  10. L. Labarga

    Present address: SLAC, Stanford, CA, USA

  11. A. Caldwell

    Present address: Columbia University, NY, USA

  12. D. Strom

    Present address: University of Chicago, Chicago, IL, USA

  13. E. Wicklund

    Present address: California Inst. of Technology, Pasadena, CA, USA

Authors and Affiliations

  1. I. Physikalisches Institut der RWTH, Aachen, Federal Republic of Germany

    W. Braunschweig, R. Gerhards, F. J. Kirschfink & H. -U. Martyn

  2. Physikalisches Institut der Universität, Bonn, Federal Republic of Germany

    B. Bock, H. M. Fischer, H. Hartmann, J. Hartmann, E. Hilger, A. Jocksch & R. Wedemeyer

  3. H.H. Wills Physics Laboratory, University of Bristol, Bristol, UK

    B. Foster, A. J. Martin & A. J. Sephton

  4. Deutsches Electronen-Synchrotron DESY, Hamburg, Federal Republic of Germany

    F. Barreiro (Alexander von Humboldt Fellow), E. Bernardi, J. Chwastowski, A. Eskreys, K. Gather, K. Genser, H. Hultschig, P. Joos, H. Kowalski, A. Ladage, B. Löhr, D. Lüke, P. Mättig, D. Notz, J. M. Pawlak, K. -U. Pösnecker, E. Ros, D. Trines, R. Walczak & G. Wolf

  5. Institut für Physik, Universität, Dortmund, Federal Republic of Germany

    H. Kolanoski

  6. II. Institut für Experimentalphysik der Universität, Hamburg, Federal Republic of Germany

    T. Kracht, J. Krüger, E. Lohrmann, G. Poelz & W. Zeuner

  7. Department of Physics, Imperial College, London, UK

    D. M. Binnie, J. Hassard, J. Shulman & D. Su

  8. Universidad Autonoma de Madrid, Madrid, Spain

    A. Leites & J. del Peso

  9. Department of Nuclear Physics, Oxford University, Oxford, UK

    C. Balkwill, M. G. Bowler, P. N. Burrows, G. P. Heath, P. N. Ratoff, I. M. Silvester, I. R. Tomalin & M. E. Veitch

  10. Rutherford Appleton Laboratory, Chilton, Didcot, UK

    G. E. Forden, J. C. Hart & D. H. Saxon

  11. Fachbereich Physik der Universität-Gesamthochschule, Siegen, Federal Republic of Germany

    S. Brandt, M. Holder & L. Labarga

  12. Weizmann Institute, Rehovot, Israel

    Y. Eisenberg, U. Karshon, G. Mikenberg, A. Montag, D. Revel, E. Ronat, A. Shapira, N. Wainer & G. Yekutieli

  13. Department of Physics, University of Wisconsin, Madison, WI, USA

    A. Caldwell, D. Muller, S. Ritz, D. Strom, M. Takashima, E. Wicklund, Sau Lan Wu & G. Zobernig

Authors
  1. W. Braunschweig
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  2. R. Gerhards
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  4. H. -U. Martyn
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  5. B. Bock
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  6. H. M. Fischer
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  8. J. Hartmann
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  9. E. Hilger
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Consortia

TASSO Collaboration

Additional information

Supported by Bundesministerium für Forschung und Technologie

Supported by UK Science and Engineering Research Council

Supported by CAICYT

Supported by the Minerva Gesellschaft für Forschung GmbH

Supported by US Dept. of Energy, contract DE-AC02-76ER000881 and by US Nat. Sci. Foundation Grant number INT-8313994 for travel

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TASSO Collaboration., Braunschweig, W., Gerhards, R. et al. Measurement of the two-photon reactionγγ →π + π − π + π − at large values ofQ 2 . Z. Phys. C - Particles and Fields 41, 353–357 (1988). https://doi.org/10.1007/BF01585619

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  • DOI: https://doi.org/10.1007/BF01585619

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