Phys. Rev. D
36,
2633–2640
(1987)
Measurement of the properties of the η’ and search for other resonances in γγ→ηπ0π0
D. Antreasyan et al.
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D. Antreasyan, H. W. Bartels, D. Besset, Ch. Bieler, J. K. Bienlein, A. Bizzeti, E. D. Bloom, I. Brock, K. Brockmüller, R. Cabenda, A. Cartacci, M. Cavalli-Sforza, R. Clare, G. Conforto, S. Cooper, R. Cowan, D. Coyne, G. Drews, C. Edwards, A. Engler, K. H. Fairfield, G. Folger, A. Fridman, J. Gaiser, D. Gelphman, G. Glaser, G. Godfrey, F. H. Heimlich, R. Hofstadter, J. Irion, Z. Jakubowski, K. Karch, S. Keh, H. Kilian, I. Kirkbride, T. Kloiber, M. Kobel, W. Koch, A. C. König, K. Königsmann, R. W. Kraemer, S. Krüger, G. Landi, R. Lee, S. Leffler, R. Lekebusch, A. M. Litke, W. Lockman, S. Lowe, B. Lurz, D. Marlow, H. Marsiske, W. Maschmann, T. Matsui, P. McBride, F. Messing, W. J. Metzger, H. Meyer, B. Monteleoni, R. Nernst, B. Niczyporuk, G. Nowak, C. Peck, P. G. Pelfer, B. Pollock, F. C. Porter, D. Prindle, P. Ratoff, B. Renger, C. Rippich, M. Scheer, P. Schmitt, J. Schotanus, A. Schwarz, F. Selonke, D. Sievers, T. Skwarnicki, V. Stock, K. Strauch, U. Strohbusch, J. Tompkins, H. J. Trost, R. T. Van de Walle, H. Vogel, A. Voigt, U. Volland, K. Wachs, K. Wacker, W. Walk, H. Wegener, D. Williams, and P. Zschorsch
California Institute of Technology, Pasadena, California 91125
Carnegie-Mellon University, Pittsburgh, Pennsylvania 15213
Cracow Institute of Nuclear Physics, Cracow, Poland
Deutsches Elektronen Synchrotron DESY, Hamburg, West Germany
Universität Erlangen-Nürnberg, Erlangen, West Germany
Istituto Nazionale di Fisica Nucleare and University of Firenze, Firenze, Italy
Institut fr Experimentalphysik I, Universität Hamburg, Hamburg, West Germany
Harvard University, Cambridge, Massachusetts 02138
University of Nijmegen and Nationaal Instituut voor Kernfysica en Hoge-Energiefysica-Nijmegen, Nijmegen, The Netherlands
Princeton University, Princeton, New Jersey 08544
Department of Physics, High Energy Physics Laboratory and Stanford Linear Accelerator Center, Stanford University, Stanford, California 94305
Universität Würzburg, Würzburg, West Germany fR(The Crystal Ball Collaboration)
Received 17 June 1987; published in the issue dated 1 November 1987
The reaction e+e-→e+e-ηπ0π0 has been observed with the Crystal Ball detector at the DORIS II storage ring at DESY. The ηπ0π0 mass spectrum is dominated by the η’, and the two-photon width Γη’→γγ is determined to be 4.6±0.4±0.6 keV. Limits on ΓX→γγ×BX→ηππ are given for other possible states.
© 1987 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevD.36.2633
DOI:
10.1103/PhysRevD.36.2633
PACS:
14.40.Cs, 13.40.Hq, 13.65.+i
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