Abstract
An experiment performed with the GAMS-4π spectrometer resulted in observing 235 ± 45 events of the decay η′ → 3π 0. The respective charge-exchange reaction at a momentum of 32.5 GeV/c was used as a source of η′ mesons. The decay branching ratio was found to be Br(η′ → 3π 0) = (1.8 ± 0.4) × 10−3. The slope parameter of the square of the respective matrix element in the linear approximation proved to be β = −0.59 ± 0.18.
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Original Russian Text © A.M. Blik, A.M. Gorin, S.V. Donskov, V.N. Kolosov, A.A. Lednev, V.A. Lishin, Yu.V. Mikhailov, V.A. Polyakov, V.D. Samoylenko, A.E. Sobol, V.P. Sugonyaev, G.V. Khaustov, 2008, published in Yadernaya Fizika, 2008, Vol. 71, No. 12, pp. 2161–2165.
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Blik, A.M., Gorin, A.M., Donskov, S.V. et al. Investigation of the decay η′ → 3 π 0 with the GAMS-4π spectrometer. Phys. Atom. Nuclei 71, 2124–2128 (2008). https://doi.org/10.1134/S1063778808120144
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DOI: https://doi.org/10.1134/S1063778808120144