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Observation of the decay η → π0γγ

F. Binon,C. Bricman,V. A. Davydov,S. V. Donskov,J. Dufournaud,P. Duteil,M. Gouanère,A. V. Inyakin,V. A. Kachanov,D. B. Kakauridze,G. V. Khaustov,A. V. Kulik,J. P. Lagnaux,A. A. Lednev,Yu. V. Mikhailov,J. P. Peigneux,Yu. D. Prokoshkin,Yu. V. Rodnov,S. A. Sadovsky,A. V. Singovsky,A. V. Starzev,J. P. Stroot,V. P. Sugonyaev

NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS（1982）

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摘要
Summary  The rare radiative decay η → π0γγ has been effectively observed and studied at the 70 GeV IHEP accelerator with the hodoscope spectrometer GAMS-2000. The branching ratio for this decay is found to be Br(η → π0γγ) = (9.5 ± 2.3)-10-4.
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