Abstract
Searches for the rare radiative decays η′→ π 0 γγ and η′ → ηγγ were performed at the GAMS-4π setup. The following upper limits were set at a 90% confidence level: Br(η′→ π 0 γγ) < 6 × 10-4 and Br(η′→ ηγγ) < 8×10-4. The π- p charge-exchange reaction at the beammomentum of 32.5GeV/c was the source of 1.3 × 106 η′ mesons. The measurements in questions were performed at the U-70 accelerator of the Institute for High Energy Physics (Protvino, Russia).
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Original Russian Text © S.V. Donskov, V.N. Kolosov, A.A. Lednev, Yu.V. Mikhailov, V.A. Polyakov, V.D. Samoylenko, G.V. Khaustov, 2015, published in Yadernaya Fizika, 2015, Vol. 78, No. 12, pp. 1106–1111.
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Donskov, S.V., Kolosov, V.N., Lednev, A.A. et al. Searches for the decays η′→ π 0 γγ and η′ → ηγγ at the GAMS-4π setup. Phys. Atom. Nuclei 78, 1043–1048 (2015). https://doi.org/10.1134/S1063778815090070
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DOI: https://doi.org/10.1134/S1063778815090070