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29 March 2024
 
  » arxiv » hep-ex/9710017

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First Physical Results from SND Detector at VEPP-2M
M.N.Achasov ; M.G.Bek ; K.I.Beloborodov ; A.V.Berdyugin ; A.V.Bozhenok ; A.D.Bukin ; D.A.Bukin ; S.V.Burdin ; V.V.Danilov ; T.V.Dimova ; S.I.Dolinsky ; V.P.Druzhinin ; M.S.Dubrovin ; I.A.Gaponenko ; V.B.Golubev ; V.N.Ivanchenko ; P.I.Ivanov ; I.A.Koop ; A.A.Korol ; M.S.Korostelev ; S.V.Koshuba ; A.P.Lysenko ; A.A.Mamutkin ; I.N.Nesterenko ; E.V.Pakhtusova ; E.A.Perevedentsev ; A.A.Polunin ; E.G.Pozdeev ; V.I.Ptitsyn ; E.E.Pyata ; A.A.Salnikov ; A.V.Savchkov ; V.V.Shary ; S.I.Serednyakov ; Yu.M.Shatunov ; V.A.Sidorov ; Z.K.Silagadze ; A.N.Skrinsky ; Yu.V.Usov ; A.A.Valishev ; A.V.Varganov ; A.V.Vasiljev ; Yu.S.Velikzhanin ;
Date 21 Oct 1997
Subject hep-ex
AbstractThe paper describes experiments with the SND detector at VEPP-2M collider, carried out during the period from October 1995 until June 1997. The total integrated luminosity of 6.4 pb^{-1} was collected in the energy range 2E=0.4-1.4 GeV (MHAD97 experiment), corresponding to 4*10^5 mu^+ mu^- pairs produced. Preliminary results of the 1996 phi-meson experiment (FI96) are presented. The total number of phi-mesons produced is 4*10^6. New data on rare decays of phi and eta (550) mesons, in particular B(phi -> eta gamma) = (1.30+-0.06+-0.07)%, B(phi -> pi^0 pi^0 gamma) = (1.1+-0.2)*10^{-4}, (M_{pi^0 pi^0} > 800 MeV), B(phi -> f^0 gamma) = (4.7+-1.0)*10^{-4}, B(phi -> eta pi^0 gamma) = (1.3+-0.5)*10^{-4}, B(phi -> eta’ gamma) < 1.7*10^{-4}, B(phi -> 2 pi^0 ) < 6*10^{-4} were obtained.
Source arXiv, hep-ex/9710017
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