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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

hep-exarXiv:hep-ex/9710017

Abstract

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*105 mu+ mu- pairs produced. Preliminary results of the 1996 phi-meson experiment (FI96) are presented. The total number of phi-mesons produced is 4*106. 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 -> pi0 pi0 gamma) = (1.1+-0.2)*10-4, (Mpi0 pi0 > 800 MeV), B(phi -> f0 gamma) = (4.7+-1.0)*10-4, B(phi -> eta pi0 gamma) = (1.3+-0.5)*10-4, B(phi -> eta' gamma) < 1.7*10-4, B(phi -> 2 pi0 ) < 6*10-4 were obtained.

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