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[en] The results of studying the mass spectrum of μ+μ-γ systems produced in πp collisions at 25 GeV/c are presented. A wide-aperture magnetic spectrometer with a hodoscope γ-detector was used to identify muon pairs and photons. There is a clear peak in the mass spectrum which corresponds to the decay eta → μ+μ-γ previously not observed. The branching ratio for the decay is estimated to be 1.5 X 10-4. (Auth.)
Journal
Phys. Lett., B; ISSN 0031-9163; 
; v. 79(1-2); p. 147-149
; v. 79(1-2); p. 147-149