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Study ofη production in two-photon collisions

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Zeitschrift für Physik C Particles and Fields

Abstract

Production of theη c meson ine + e − quasireal two photon collisions has been looked for in three channels. The data were obtained from an integrated luminosity of 189 pb−1. Anη c signal is observed in two decay modes (K 0 s K ±π∓,π+π-π+π-) with a combined statistical significance of 3.5 standard deviations. Using the knownη c branching ratios to these channels and toK + K -π+π- the combined partialη c width to γγ isΓ γγ(η c ). The first error is statistical, and the second one includes the systematic and branching ratio errors. Calculated as an upper limit we obtainΓ γγ(η c ) (95% C.L., including the systematic error).

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Author notes

  1. T. Kracht

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

  2. B. Bock

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

  3. V. Mertens & J. Chwastowski

    Present address: CERN, Geneva, Switzerland

  4. A. Eskreys

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

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

    Present address: Warsaw University, Poland

  6. P. Märtig

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

  7. G. E. Forden

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

  8. L. Labarga

    Present address: SLAC, Stanford, CA, USA

  9. L. Lyons

    Present address: Dept. of Nuclear Physics, Oxford University, Oxford, UK

  10. A. Caldwell

    Present address: Columbia University, NY, USA

  11. D. Strom

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

  12. 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, V. Mertens & R. Wedemeyer

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

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

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

    E. Bernardi, J. Chwastowski, A. Eskreys, K. Gather, K. Genser, H. Hultschig, P. Joos, H. Kowalski, A. Ladage, B. Löhr, D. Lüke, P. Märtig, D. Notz, J. M. Pawlak, K. -U. Posnecker, E. Ros, D. Trines, R. Walczak & G. Wolf

  5. Institut für Physik, Universität, Dourtmund, 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

    J. Hassard, J. Shulman & D. Su

  8. Universidad Autonoma de Madrid, Madrid, Spain

    F. Barreiro, 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. Ratoff, I. Silvester, I. Tomalin & 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

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

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

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

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  1. W. Braunschweig
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  2. R. Gerhards
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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

Partially supported by grant CPBP 01.06

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TASSO Collaboration., Braunschweig, W., Gerhards, R. et al. Study ofη production in two-photon collisions. Z. Phys. C - Particles and Fields 41, 533–538 (1989). https://doi.org/10.1007/BF01564698

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  • DOI: https://doi.org/10.1007/BF01564698

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