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First Physical Results from SND Detector at VEPP-2M

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arxiv hep-ex/9710017 v2 pith:426BPEH4 submitted 1997-10-21 hep-ex

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
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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
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keywords gammadetectorexperimentproducedresultstotalvepp-2mcarried
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The 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.

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