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IHEP 2005 - 47 (In Russian) | |
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| F.Binon (ULB, Brussel, Belgium), A.M.Blik, A.M. Gorin S.V.Donskov, G.V.Khaustov, V.N.Kolosov, M.E.Ladygin, A.A.Lednev, V.A.Lapshin, I.V.Manuilov, Yu.V.Mokhailov, V.A.Poliakov, V.D.Samoilenko, A.E.Sobol, V.P.Sugoniaev (IHEP, Protvino, Russia), J.-P.Stroot (ULB-VUB, Brussel, Belgium), J.-P. Piegneux (LAPP, Annecy, France), S.Inaba, K.Takamatsu, T.Tsuru (KEK, Tsukuba, Japan) | ||
| Search the Rare and Forbidden Neutral Decays of \eta-meson on GAMS-4\pi | ||
| Protvino, 2005. – p. 13, figs. 11, tables 1, refs.: 25. | ||
A search for the rare and forbidden neutral decays of \eta-meson
with GAMS-4\pi setup has been performed.
The charge-exchange reaction at 32.5 GeV/c was used as a source
of 3.7 \cdot 10^{6} \eta-mesons.
At the 90\% confidence level the following upper limits was established:
BR(\eta --> 3\gamma) more 1.6 \cdot 10^{-4},
BR(\eta --> 4\gamma) more 2.8 \cdot 10^{-4},
BR(\eta --> \pi^{o}\pi^{o}) more 3.5 \cdot 10^{-4},
BR(\eta --> \pi^{o}\pi^{o}\gamma) more 1.7 \cdot 10^{-3},
BR(\eta --> \pi^{o}\pi^{o}\gamma\gamma) more 4.0 \cdot 10^{-3},
BR(\eta --> 3\pi^{o}\gamma) more 2.4 \cdot 10^{-4},
BR(\eta --> 4\pi^{o}) more 2.0 \cdot 10^{-5}.
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